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gecko-dev/mfbt/tests/TestVariant.cpp
Gerald Squelart 0e7e45ed66 Bug 1500811 - Variant::as()&&, match()&& - r=sg 
`as<...>()` on an rvalue variant returns the contained value as rvalue-reference.
`match()` on an rvalue variant forwards the contained value as rvalue-reference.
So now the contained values can be efficiently moved-from.

There are also equivalents for `const&&`, which should be rare.

For `match(2+ matchers)`, the static_assert for same return types has been moved to `Impl::matchN`. Also, it doesn't rely on `FunctionTypeTraits` anymore, which has the added benefit of allowing `auto` in individual matchers.

Differential Revision: https://phabricator.services.mozilla.com/D98050
2020-12-02 00:17:46 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <type_traits>
#include "mozilla/UniquePtr.h"
#include "mozilla/Variant.h"
#include <tuple>
using mozilla::MakeUnique;
using mozilla::UniquePtr;
using mozilla::Variant;
struct Destroyer {
static int destroyedCount;
~Destroyer() { destroyedCount++; }
};
int Destroyer::destroyedCount = 0;
static void testDetails() {
printf("testDetails\n");
using mozilla::detail::Nth;
// Test Nth with a list of 1 item.
static_assert(std::is_same_v<typename Nth<0, int>::Type, int>,
"Nth<0, int>::Type should be int");
// Test Nth with a list of more than 1 item.
static_assert(std::is_same_v<typename Nth<0, int, char>::Type, int>,
"Nth<0, int, char>::Type should be int");
static_assert(std::is_same_v<typename Nth<1, int, char>::Type, char>,
"Nth<1, int, char>::Type should be char");
using mozilla::detail::SelectVariantType;
// SelectVariantType for zero items (shouldn't happen, but `count` should
// still work ok.)
static_assert(SelectVariantType<int, char>::count == 0,
"SelectVariantType<int, char>::count should be 0");
// SelectVariantType for 1 type, for all combinations from/to T, const T,
// const T&, T&&
// - type to type
static_assert(std::is_same_v<typename SelectVariantType<int, int>::Type, int>,
"SelectVariantType<int, int>::Type should be int");
static_assert(SelectVariantType<int, int>::count == 1,
"SelectVariantType<int, int>::count should be 1");
// - type to const type
static_assert(std::is_same_v<typename SelectVariantType<int, const int>::Type,
const int>,
"SelectVariantType<int, const int>::Type should be const int");
static_assert(SelectVariantType<int, const int>::count == 1,
"SelectVariantType<int, const int>::count should be 1");
// - type to const type&
static_assert(
std::is_same_v<typename SelectVariantType<int, const int&>::Type,
const int&>,
"SelectVariantType<int, const int&>::Type should be const int&");
static_assert(SelectVariantType<int, const int&>::count == 1,
"SelectVariantType<int, const int&>::count should be 1");
// - type to type&&
static_assert(
std::is_same_v<typename SelectVariantType<int, int&&>::Type, int&&>,
"SelectVariantType<int, int&&>::Type should be int&&");
static_assert(SelectVariantType<int, int&&>::count == 1,
"SelectVariantType<int, int&&>::count should be 1");
// - const type to type
static_assert(
std::is_same_v<typename SelectVariantType<const int, int>::Type, int>,
"SelectVariantType<const int, int>::Type should be int");
static_assert(SelectVariantType<const int, int>::count == 1,
"SelectVariantType<const int, int>::count should be 1");
// - const type to const type
static_assert(
std::is_same_v<typename SelectVariantType<const int, const int>::Type,
const int>,
"SelectVariantType<const int, const int>::Type should be const int");
static_assert(SelectVariantType<const int, const int>::count == 1,
"SelectVariantType<const int, const int>::count should be 1");
// - const type to const type&
static_assert(
std::is_same_v<typename SelectVariantType<const int, const int&>::Type,
const int&>,
"SelectVariantType<const int, const int&>::Type should be const int&");
static_assert(SelectVariantType<const int, const int&>::count == 1,
"SelectVariantType<const int, const int&>::count should be 1");
// - const type to type&&
static_assert(
std::is_same_v<typename SelectVariantType<const int, int&&>::Type, int&&>,
"SelectVariantType<const int, int&&>::Type should be int&&");
static_assert(SelectVariantType<const int, int&&>::count == 1,
"SelectVariantType<const int, int&&>::count should be 1");
// - const type& to type
static_assert(
std::is_same_v<typename SelectVariantType<const int&, int>::Type, int>,
"SelectVariantType<const int&, int>::Type should be int");
static_assert(SelectVariantType<const int&, int>::count == 1,
"SelectVariantType<const int&, int>::count should be 1");
// - const type& to const type
static_assert(
std::is_same_v<typename SelectVariantType<const int&, const int>::Type,
const int>,
"SelectVariantType<const int&, const int>::Type should be const int");
static_assert(SelectVariantType<const int&, const int>::count == 1,
"SelectVariantType<const int&, const int>::count should be 1");
// - const type& to const type&
static_assert(
std::is_same_v<typename SelectVariantType<const int&, const int&>::Type,
const int&>,
"SelectVariantType<const int&, const int&>::Type should be const int&");
static_assert(SelectVariantType<const int&, const int&>::count == 1,
"SelectVariantType<const int&, const int&>::count should be 1");
// - const type& to type&&
static_assert(
std::is_same_v<typename SelectVariantType<const int&, int&&>::Type,
int&&>,
"SelectVariantType<const int&, int&&>::Type should be int&&");
static_assert(SelectVariantType<const int&, int&&>::count == 1,
"SelectVariantType<const int&, int&&>::count should be 1");
// - type&& to type
static_assert(
std::is_same_v<typename SelectVariantType<int&&, int>::Type, int>,
"SelectVariantType<int&&, int>::Type should be int");
static_assert(SelectVariantType<int&&, int>::count == 1,
"SelectVariantType<int&&, int>::count should be 1");
// - type&& to const type
static_assert(
std::is_same_v<typename SelectVariantType<int&&, const int>::Type,
const int>,
"SelectVariantType<int&&, const int>::Type should be const int");
static_assert(SelectVariantType<int&&, const int>::count == 1,
"SelectVariantType<int&&, const int>::count should be 1");
// - type&& to const type&
static_assert(
std::is_same_v<typename SelectVariantType<int&&, const int&>::Type,
const int&>,
"SelectVariantType<int&&, const int&>::Type should be const int&");
static_assert(SelectVariantType<int&&, const int&>::count == 1,
"SelectVariantType<int&&, const int&>::count should be 1");
// - type&& to type&&
static_assert(
std::is_same_v<typename SelectVariantType<int&&, int&&>::Type, int&&>,
"SelectVariantType<int&&, int&&>::Type should be int&&");
static_assert(SelectVariantType<int&&, int&&>::count == 1,
"SelectVariantType<int&&, int&&>::count should be 1");
// SelectVariantType for two different types.
// (Don't test all combinations, trust that the above tests are sufficient.)
static_assert(
std::is_same_v<typename SelectVariantType<int, int, char>::Type, int>,
"SelectVariantType<int, int, char>::Type should be int");
static_assert(SelectVariantType<int, int, char>::count == 1,
"SelectVariantType<int, int, char>::count should be 1");
static_assert(
std::is_same_v<typename SelectVariantType<char, int, char>::Type, char>,
"SelectVariantType<char, int, char>::Type should be char");
static_assert(SelectVariantType<char, int, char>::count == 1,
"SelectVariantType<char, int, char>::count should be 1");
// SelectVariantType for two identical types.
static_assert(
std::is_same_v<typename SelectVariantType<int, int, int>::Type, int>,
"SelectVariantType<int, int, int>::Type should be int");
static_assert(SelectVariantType<int, int, int>::count == 2,
"SelectVariantType<int, int, int>::count should be 2");
// SelectVariantType for two identical types, with others around.
static_assert(
std::is_same_v<typename SelectVariantType<int, char, int, int>::Type,
int>,
"SelectVariantType<int, char, int, int>::Type should be int");
static_assert(SelectVariantType<int, char, int, int>::count == 2,
"SelectVariantType<int, char, int, int>::count should be 2");
static_assert(
std::is_same_v<typename SelectVariantType<int, int, char, int>::Type,
int>,
"SelectVariantType<int, int, char, int>::Type should be int");
static_assert(SelectVariantType<int, int, char, int>::count == 2,
"SelectVariantType<int, int, char, int>::count should be 2");
static_assert(
std::is_same_v<typename SelectVariantType<int, int, int, char>::Type,
int>,
"SelectVariantType<int, int, int, char>::Type should be int");
static_assert(SelectVariantType<int, int, int, char>::count == 2,
"SelectVariantType<int, int, int, char>::count should be 2");
static_assert(
std::is_same_v<
typename SelectVariantType<int, char, int, char, int, char>::Type,
int>,
"SelectVariantType<int, char, int, char, int, char>::Type should be int");
static_assert(
SelectVariantType<int, char, int, char, int, char>::count == 2,
"SelectVariantType<int, char, int, char, int, char>::count should be 2");
// SelectVariantType for two identically-selectable types (first one wins!).
static_assert(
std::is_same_v<typename SelectVariantType<int, int, const int>::Type,
int>,
"SelectVariantType<int, int, const int>::Type should be int");
static_assert(SelectVariantType<int, int, const int>::count == 2,
"SelectVariantType<int, int, const int>::count should be 2");
static_assert(
std::is_same_v<typename SelectVariantType<int, const int, int>::Type,
const int>,
"SelectVariantType<int, const int, int>::Type should be const int");
static_assert(SelectVariantType<int, const int, int>::count == 2,
"SelectVariantType<int, const int, int>::count should be 2");
static_assert(
std::is_same_v<typename SelectVariantType<int, const int, int&&>::Type,
const int>,
"SelectVariantType<int, const int, int&&>::Type should be const int");
static_assert(SelectVariantType<int, const int, int&&>::count == 2,
"SelectVariantType<int, const int, int&&>::count should be 2");
}
static void testSimple() {
printf("testSimple\n");
using V = Variant<uint32_t, uint64_t>;
// Non-const lvalue.
V v(uint64_t(1));
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
MOZ_RELEASE_ASSERT(!v.is<uint32_t>());
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
MOZ_RELEASE_ASSERT(v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
static_assert(std::is_same_v<decltype(v.as<1>()), uint64_t&>,
"v.as<1>() should return a uint64_t&");
MOZ_RELEASE_ASSERT(v.as<1>() == 1);
// Const lvalue.
const V& cv = v;
MOZ_RELEASE_ASSERT(cv.is<uint64_t>());
MOZ_RELEASE_ASSERT(!cv.is<uint32_t>());
MOZ_RELEASE_ASSERT(cv.as<uint64_t>() == 1);
MOZ_RELEASE_ASSERT(cv.is<1>());
MOZ_RELEASE_ASSERT(!cv.is<0>());
static_assert(std::is_same_v<decltype(cv.as<1>()), const uint64_t&>,
"cv.as<1>() should return a const uint64_t&");
MOZ_RELEASE_ASSERT(cv.as<1>() == 1);
// Non-const rvalue, using a function to create a temporary.
auto MakeV = []() { return V(uint64_t(1)); };
MOZ_RELEASE_ASSERT(MakeV().is<uint64_t>());
MOZ_RELEASE_ASSERT(!MakeV().is<uint32_t>());
MOZ_RELEASE_ASSERT(MakeV().as<uint64_t>() == 1);
MOZ_RELEASE_ASSERT(MakeV().is<1>());
MOZ_RELEASE_ASSERT(!MakeV().is<0>());
static_assert(std::is_same_v<decltype(MakeV().as<1>()), uint64_t&&>,
"MakeV().as<1>() should return a uint64_t&&");
MOZ_RELEASE_ASSERT(MakeV().as<1>() == 1);
// Const rvalue, using a function to create a temporary.
auto MakeCV = []() -> const V { return V(uint64_t(1)); };
MOZ_RELEASE_ASSERT(MakeCV().is<uint64_t>());
MOZ_RELEASE_ASSERT(!MakeCV().is<uint32_t>());
MOZ_RELEASE_ASSERT(MakeCV().as<uint64_t>() == 1);
MOZ_RELEASE_ASSERT(MakeCV().is<1>());
MOZ_RELEASE_ASSERT(!MakeCV().is<0>());
static_assert(std::is_same_v<decltype(MakeCV().as<1>()), const uint64_t&&>,
"MakeCV().as<1>() should return a const uint64_t&&");
MOZ_RELEASE_ASSERT(MakeCV().as<1>() == 1);
}
static void testDuplicate() {
printf("testDuplicate\n");
Variant<uint32_t, uint64_t, uint32_t> v(uint64_t(1));
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
MOZ_RELEASE_ASSERT(v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
MOZ_RELEASE_ASSERT(!v.is<2>());
static_assert(std::is_same_v<decltype(v.as<0>()), uint32_t&>,
"as<0>() should return a uint64_t");
static_assert(std::is_same_v<decltype(v.as<1>()), uint64_t&>,
"as<1>() should return a uint64_t");
static_assert(std::is_same_v<decltype(v.as<2>()), uint32_t&>,
"as<2>() should return a uint64_t");
MOZ_RELEASE_ASSERT(v.as<1>() == 1);
MOZ_RELEASE_ASSERT(v.extract<1>() == 1);
}
static void testConstructionWithVariantType() {
Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantType<uint64_t>{}, 3);
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
// MOZ_RELEASE_ASSERT(!v.is<uint32_t>()); // uint32_t is not unique!
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 3);
}
static void testConstructionWithVariantIndex() {
Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantIndex<2>{}, 2);
MOZ_RELEASE_ASSERT(!v.is<uint64_t>());
// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
MOZ_RELEASE_ASSERT(!v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
MOZ_RELEASE_ASSERT(v.is<2>());
MOZ_RELEASE_ASSERT(v.as<2>() == 2);
MOZ_RELEASE_ASSERT(v.extract<2>() == 2);
}
static void testEmplaceWithType() {
printf("testEmplaceWithType\n");
Variant<uint32_t, uint64_t, uint32_t> v1(mozilla::VariantIndex<0>{}, 0);
v1.emplace<uint64_t>(3);
MOZ_RELEASE_ASSERT(v1.is<uint64_t>());
MOZ_RELEASE_ASSERT(v1.as<uint64_t>() == 3);
Variant<UniquePtr<int>, char> v2('a');
v2.emplace<UniquePtr<int>>();
MOZ_RELEASE_ASSERT(v2.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(!v2.as<UniquePtr<int>>().get());
Variant<UniquePtr<int>, char> v3('a');
v3.emplace<UniquePtr<int>>(MakeUnique<int>(4));
MOZ_RELEASE_ASSERT(v3.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(*v3.as<UniquePtr<int>>().get() == 4);
}
static void testEmplaceWithIndex() {
printf("testEmplaceWithIndex\n");
Variant<uint32_t, uint64_t, uint32_t> v1(mozilla::VariantIndex<1>{}, 0);
v1.emplace<2>(2);
MOZ_RELEASE_ASSERT(!v1.is<uint64_t>());
MOZ_RELEASE_ASSERT(!v1.is<1>());
MOZ_RELEASE_ASSERT(!v1.is<0>());
MOZ_RELEASE_ASSERT(v1.is<2>());
MOZ_RELEASE_ASSERT(v1.as<2>() == 2);
MOZ_RELEASE_ASSERT(v1.extract<2>() == 2);
Variant<UniquePtr<int>, char> v2('a');
v2.emplace<0>();
MOZ_RELEASE_ASSERT(v2.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(!v2.is<1>());
MOZ_RELEASE_ASSERT(v2.is<0>());
MOZ_RELEASE_ASSERT(!v2.as<0>().get());
MOZ_RELEASE_ASSERT(!v2.extract<0>().get());
Variant<UniquePtr<int>, char> v3('a');
v3.emplace<0>(MakeUnique<int>(4));
MOZ_RELEASE_ASSERT(v3.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(!v3.is<1>());
MOZ_RELEASE_ASSERT(v3.is<0>());
MOZ_RELEASE_ASSERT(*v3.as<0>().get() == 4);
MOZ_RELEASE_ASSERT(*v3.extract<0>().get() == 4);
}
static void testCopy() {
printf("testCopy\n");
Variant<uint32_t, uint64_t> v1(uint64_t(1));
Variant<uint32_t, uint64_t> v2(v1);
MOZ_RELEASE_ASSERT(v2.is<uint64_t>());
MOZ_RELEASE_ASSERT(!v2.is<uint32_t>());
MOZ_RELEASE_ASSERT(v2.as<uint64_t>() == 1);
Variant<uint32_t, uint64_t> v3(uint32_t(10));
v3 = v2;
MOZ_RELEASE_ASSERT(v3.is<uint64_t>());
MOZ_RELEASE_ASSERT(v3.as<uint64_t>() == 1);
}
static void testMove() {
printf("testMove\n");
Variant<UniquePtr<int>, char> v1(MakeUnique<int>(5));
Variant<UniquePtr<int>, char> v2(std::move(v1));
MOZ_RELEASE_ASSERT(v2.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(*v2.as<UniquePtr<int>>() == 5);
MOZ_RELEASE_ASSERT(v1.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(v1.as<UniquePtr<int>>() == nullptr);
Destroyer::destroyedCount = 0;
{
Variant<char, UniquePtr<Destroyer>> v3(MakeUnique<Destroyer>());
Variant<char, UniquePtr<Destroyer>> v4(std::move(v3));
Variant<char, UniquePtr<Destroyer>> v5('a');
v5 = std::move(v4);
auto ptr = v5.extract<UniquePtr<Destroyer>>();
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 0);
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 1);
}
static void testDestructor() {
printf("testDestructor\n");
Destroyer::destroyedCount = 0;
{
Destroyer d;
{
Variant<char, UniquePtr<char[]>, Destroyer> v1(d);
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount ==
0); // None destroyed yet.
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount ==
1); // v1's copy of d is destroyed.
{
Variant<char, UniquePtr<char[]>, Destroyer> v2(
mozilla::VariantIndex<2>{});
v2.emplace<Destroyer>(d);
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount ==
2); // v2's initial value is destroyed.
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount ==
3); // v2's second value is destroyed.
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 4); // d is destroyed.
}
static void testEquality() {
printf("testEquality\n");
using V = Variant<char, int>;
V v0('a');
V v1('b');
V v2('b');
V v3(42);
V v4(27);
V v5(27);
V v6(int('b'));
MOZ_RELEASE_ASSERT(v0 != v1);
MOZ_RELEASE_ASSERT(v1 == v2);
MOZ_RELEASE_ASSERT(v2 != v3);
MOZ_RELEASE_ASSERT(v3 != v4);
MOZ_RELEASE_ASSERT(v4 == v5);
MOZ_RELEASE_ASSERT(v1 != v6);
MOZ_RELEASE_ASSERT(v0 == v0);
MOZ_RELEASE_ASSERT(v1 == v1);
MOZ_RELEASE_ASSERT(v2 == v2);
MOZ_RELEASE_ASSERT(v3 == v3);
MOZ_RELEASE_ASSERT(v4 == v4);
MOZ_RELEASE_ASSERT(v5 == v5);
MOZ_RELEASE_ASSERT(v6 == v6);
}
// Matcher that returns a description of how its call-operator was invoked.
struct Describer {
enum class ParameterSize { NA, U8, U32, U64 };
enum class ParameterQualifier {
NA,
ParamLREF,
ParamCLREF,
ParamRREF,
ParamCRREF
};
enum class ThisQualifier { NA, ThisLREF, ThisCLREF, ThisRREF, ThisCRREF };
using Result =
std::tuple<ParameterSize, ParameterQualifier, ThisQualifier, uint64_t>;
#define RESULT(SIZE, PQUAL, TQUAL, VALUE) \
Describer::Result(Describer::ParameterSize::SIZE, \
Describer::ParameterQualifier::PQUAL, \
Describer::ThisQualifier::TQUAL, VALUE)
#define CALL(TYPE, SIZE, PQUAL, TREF, TQUAL) \
Result operator()(TYPE aValue) TREF { \
return RESULT(SIZE, PQUAL, TQUAL, aValue); \
}
// All combinations of possible call operators:
// Every line, the parameter integer type changes.
// Every 3 lines, the parameter type changes constness.
// Every 6 lines, the parameter changes reference l/r-valueness.
// Every 12 lines, the member function qualifier changes constness.
// After 24 lines, the member function qualifier changes ref l/r-valueness.
CALL(uint8_t&, U8, ParamLREF, &, ThisLREF)
CALL(uint32_t&, U32, ParamLREF, &, ThisLREF)
CALL(uint64_t&, U64, ParamLREF, &, ThisLREF)
CALL(const uint8_t&, U8, ParamCLREF, &, ThisLREF)
CALL(const uint32_t&, U32, ParamCLREF, &, ThisLREF)
CALL(const uint64_t&, U64, ParamCLREF, &, ThisLREF)
CALL(uint8_t&&, U8, ParamRREF, &, ThisLREF)
CALL(uint32_t&&, U32, ParamRREF, &, ThisLREF)
CALL(uint64_t&&, U64, ParamRREF, &, ThisLREF)
CALL(const uint8_t&&, U8, ParamCRREF, &, ThisLREF)
CALL(const uint32_t&&, U32, ParamCRREF, &, ThisLREF)
CALL(const uint64_t&&, U64, ParamCRREF, &, ThisLREF)
CALL(uint8_t&, U8, ParamLREF, const&, ThisCLREF)
CALL(uint32_t&, U32, ParamLREF, const&, ThisCLREF)
CALL(uint64_t&, U64, ParamLREF, const&, ThisCLREF)
CALL(const uint8_t&, U8, ParamCLREF, const&, ThisCLREF)
CALL(const uint32_t&, U32, ParamCLREF, const&, ThisCLREF)
CALL(const uint64_t&, U64, ParamCLREF, const&, ThisCLREF)
CALL(uint8_t&&, U8, ParamRREF, const&, ThisCLREF)
CALL(uint32_t&&, U32, ParamRREF, const&, ThisCLREF)
CALL(uint64_t&&, U64, ParamRREF, const&, ThisCLREF)
CALL(const uint8_t&&, U8, ParamCRREF, const&, ThisCLREF)
CALL(const uint32_t&&, U32, ParamCRREF, const&, ThisCLREF)
CALL(const uint64_t&&, U64, ParamCRREF, const&, ThisCLREF)
CALL(uint8_t&, U8, ParamLREF, &&, ThisRREF)
CALL(uint32_t&, U32, ParamLREF, &&, ThisRREF)
CALL(uint64_t&, U64, ParamLREF, &&, ThisRREF)
CALL(const uint8_t&, U8, ParamCLREF, &&, ThisRREF)
CALL(const uint32_t&, U32, ParamCLREF, &&, ThisRREF)
CALL(const uint64_t&, U64, ParamCLREF, &&, ThisRREF)
CALL(uint8_t&&, U8, ParamRREF, &&, ThisRREF)
CALL(uint32_t&&, U32, ParamRREF, &&, ThisRREF)
CALL(uint64_t&&, U64, ParamRREF, &&, ThisRREF)
CALL(const uint8_t&&, U8, ParamCRREF, &&, ThisRREF)
CALL(const uint32_t&&, U32, ParamCRREF, &&, ThisRREF)
CALL(const uint64_t&&, U64, ParamCRREF, &&, ThisRREF)
CALL(uint8_t&, U8, ParamLREF, const&&, ThisCRREF)
CALL(uint32_t&, U32, ParamLREF, const&&, ThisCRREF)
CALL(uint64_t&, U64, ParamLREF, const&&, ThisCRREF)
CALL(const uint8_t&, U8, ParamCLREF, const&&, ThisCRREF)
CALL(const uint32_t&, U32, ParamCLREF, const&&, ThisCRREF)
CALL(const uint64_t&, U64, ParamCLREF, const&&, ThisCRREF)
CALL(uint8_t&&, U8, ParamRREF, const&&, ThisCRREF)
CALL(uint32_t&&, U32, ParamRREF, const&&, ThisCRREF)
CALL(uint64_t&&, U64, ParamRREF, const&&, ThisCRREF)
CALL(const uint8_t&&, U8, ParamCRREF, const&&, ThisCRREF)
CALL(const uint32_t&&, U32, ParamCRREF, const&&, ThisCRREF)
CALL(const uint64_t&&, U64, ParamCRREF, const&&, ThisCRREF)
#undef CALL
// Catch-all, to verify that there is no call with any type other than the
// expected ones above.
template <typename Other>
Result operator()(const Other&) {
MOZ_RELEASE_ASSERT(false);
return RESULT(NA, NA, NA, 0);
}
};
static void testMatching() {
printf("testMatching\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
Describer desc;
const Describer descConst;
auto MakeDescriber = []() { return Describer(); };
auto MakeConstDescriber = []() -> const Describer { return Describer(); };
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
// Create a temporary variant by returning a copy of one.
auto CopyV = [](const V& aV) { return aV; };
// Create a temporary variant by returning a const copy of one.
auto CopyConstV = [](const V& aV) -> const V { return aV; };
// All combinations of possible calls:
// Every line, the variant integer type changes.
// Every 3 lines, the variant type changes constness.
// Every 6 lines, the variant changes reference l/r-valueness.
// Every 12 lines, the matcher changes constness.
// After 24 lines, the matcher changes ref l/r-valueness.
MOZ_RELEASE_ASSERT(v1.match(desc) == RESULT(U8, ParamLREF, ThisLREF, 1));
MOZ_RELEASE_ASSERT(v2.match(desc) == RESULT(U32, ParamLREF, ThisLREF, 2));
MOZ_RELEASE_ASSERT(v3.match(desc) == RESULT(U64, ParamLREF, ThisLREF, 3));
MOZ_RELEASE_ASSERT(constRef1.match(desc) ==
RESULT(U8, ParamCLREF, ThisLREF, 1));
MOZ_RELEASE_ASSERT(constRef2.match(desc) ==
RESULT(U32, ParamCLREF, ThisLREF, 2));
MOZ_RELEASE_ASSERT(constRef3.match(desc) ==
RESULT(U64, ParamCLREF, ThisLREF, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(desc) ==
RESULT(U8, ParamRREF, ThisLREF, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(desc) ==
RESULT(U32, ParamRREF, ThisLREF, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(desc) ==
RESULT(U64, ParamRREF, ThisLREF, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(desc) ==
RESULT(U8, ParamCRREF, ThisLREF, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(desc) ==
RESULT(U32, ParamCRREF, ThisLREF, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(desc) ==
RESULT(U64, ParamCRREF, ThisLREF, 3));
MOZ_RELEASE_ASSERT(v1.match(descConst) ==
RESULT(U8, ParamLREF, ThisCLREF, 1));
MOZ_RELEASE_ASSERT(v2.match(descConst) ==
RESULT(U32, ParamLREF, ThisCLREF, 2));
MOZ_RELEASE_ASSERT(v3.match(descConst) ==
RESULT(U64, ParamLREF, ThisCLREF, 3));
MOZ_RELEASE_ASSERT(constRef1.match(descConst) ==
RESULT(U8, ParamCLREF, ThisCLREF, 1));
MOZ_RELEASE_ASSERT(constRef2.match(descConst) ==
RESULT(U32, ParamCLREF, ThisCLREF, 2));
MOZ_RELEASE_ASSERT(constRef3.match(descConst) ==
RESULT(U64, ParamCLREF, ThisCLREF, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(descConst) ==
RESULT(U8, ParamRREF, ThisCLREF, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(descConst) ==
RESULT(U32, ParamRREF, ThisCLREF, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(descConst) ==
RESULT(U64, ParamRREF, ThisCLREF, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(descConst) ==
RESULT(U8, ParamCRREF, ThisCLREF, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(descConst) ==
RESULT(U32, ParamCRREF, ThisCLREF, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(descConst) ==
RESULT(U64, ParamCRREF, ThisCLREF, 3));
MOZ_RELEASE_ASSERT(v1.match(MakeDescriber()) ==
RESULT(U8, ParamLREF, ThisRREF, 1));
MOZ_RELEASE_ASSERT(v2.match(MakeDescriber()) ==
RESULT(U32, ParamLREF, ThisRREF, 2));
MOZ_RELEASE_ASSERT(v3.match(MakeDescriber()) ==
RESULT(U64, ParamLREF, ThisRREF, 3));
MOZ_RELEASE_ASSERT(constRef1.match(MakeDescriber()) ==
RESULT(U8, ParamCLREF, ThisRREF, 1));
MOZ_RELEASE_ASSERT(constRef2.match(MakeDescriber()) ==
RESULT(U32, ParamCLREF, ThisRREF, 2));
MOZ_RELEASE_ASSERT(constRef3.match(MakeDescriber()) ==
RESULT(U64, ParamCLREF, ThisRREF, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(MakeDescriber()) ==
RESULT(U8, ParamRREF, ThisRREF, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(MakeDescriber()) ==
RESULT(U32, ParamRREF, ThisRREF, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(MakeDescriber()) ==
RESULT(U64, ParamRREF, ThisRREF, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(MakeDescriber()) ==
RESULT(U8, ParamCRREF, ThisRREF, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(MakeDescriber()) ==
RESULT(U32, ParamCRREF, ThisRREF, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(MakeDescriber()) ==
RESULT(U64, ParamCRREF, ThisRREF, 3));
MOZ_RELEASE_ASSERT(v1.match(MakeConstDescriber()) ==
RESULT(U8, ParamLREF, ThisCRREF, 1));
MOZ_RELEASE_ASSERT(v2.match(MakeConstDescriber()) ==
RESULT(U32, ParamLREF, ThisCRREF, 2));
MOZ_RELEASE_ASSERT(v3.match(MakeConstDescriber()) ==
RESULT(U64, ParamLREF, ThisCRREF, 3));
MOZ_RELEASE_ASSERT(constRef1.match(MakeConstDescriber()) ==
RESULT(U8, ParamCLREF, ThisCRREF, 1));
MOZ_RELEASE_ASSERT(constRef2.match(MakeConstDescriber()) ==
RESULT(U32, ParamCLREF, ThisCRREF, 2));
MOZ_RELEASE_ASSERT(constRef3.match(MakeConstDescriber()) ==
RESULT(U64, ParamCLREF, ThisCRREF, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(MakeConstDescriber()) ==
RESULT(U8, ParamRREF, ThisCRREF, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(MakeConstDescriber()) ==
RESULT(U32, ParamRREF, ThisCRREF, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(MakeConstDescriber()) ==
RESULT(U64, ParamRREF, ThisCRREF, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(MakeConstDescriber()) ==
RESULT(U8, ParamCRREF, ThisCRREF, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(MakeConstDescriber()) ==
RESULT(U32, ParamCRREF, ThisCRREF, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(MakeConstDescriber()) ==
RESULT(U64, ParamCRREF, ThisCRREF, 3));
}
static void testMatchingLambda() {
printf("testMatchingLambda\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
// Note: Lambdas' call operators are const by default (unless the lambda is
// declared `mutable`).
// There is no need to test mutable lambdas, nor rvalue lambda, because there
// would be no way to distinguish how each lambda is actually invoked because
// there is only one choice of call operator in each overload set.
auto desc = [](auto&& a) {
if constexpr (std::is_same_v<decltype(a), uint8_t&>) {
return RESULT(U8, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&>) {
return RESULT(U8, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint8_t&&>) {
return RESULT(U8, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&&>) {
return RESULT(U8, ParamCRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&>) {
return RESULT(U32, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&>) {
return RESULT(U32, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&&>) {
return RESULT(U32, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&&>) {
return RESULT(U32, ParamCRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&>) {
return RESULT(U64, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&>) {
return RESULT(U64, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&&>) {
return RESULT(U64, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&&>) {
return RESULT(U64, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
// Create a temporary variant by returning a copy of one.
auto CopyV = [](const V& aV) { return aV; };
// Create a temporary variant by returning a const copy of one.
auto CopyConstV = [](const V& aV) -> const V { return aV; };
MOZ_RELEASE_ASSERT(v1.match(desc) == RESULT(U8, ParamLREF, NA, 1));
MOZ_RELEASE_ASSERT(v2.match(desc) == RESULT(U32, ParamLREF, NA, 2));
MOZ_RELEASE_ASSERT(v3.match(desc) == RESULT(U64, ParamLREF, NA, 3));
MOZ_RELEASE_ASSERT(constRef1.match(desc) == RESULT(U8, ParamCLREF, NA, 1));
MOZ_RELEASE_ASSERT(constRef2.match(desc) == RESULT(U32, ParamCLREF, NA, 2));
MOZ_RELEASE_ASSERT(constRef3.match(desc) == RESULT(U64, ParamCLREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(desc) == RESULT(U8, ParamRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(desc) == RESULT(U32, ParamRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(desc) == RESULT(U64, ParamRREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(desc) ==
RESULT(U8, ParamCRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(desc) ==
RESULT(U32, ParamCRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(desc) ==
RESULT(U64, ParamCRREF, NA, 3));
}
static void testMatchingLambdaWithIndex() {
printf("testMatchingLambdaWithIndex\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
// Note: Lambdas' call operators are const by default (unless the lambda is
// declared `mutable`), hence the use of "...Const" strings below.
// There is no need to test mutable lambdas, nor rvalue lambda, because there
// would be no way to distinguish how each lambda is actually invoked because
// there is only one choice of call operator in each overload set.
auto desc = [](auto aIndex, auto&& a) {
static_assert(sizeof(aIndex) < sizeof(size_t), "Expected small index type");
if constexpr (std::is_same_v<decltype(a), uint8_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 0);
return RESULT(U8, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 0);
return RESULT(U8, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint8_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 0);
return RESULT(U8, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 0);
return RESULT(U8, ParamCRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 1);
return RESULT(U32, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 1);
return RESULT(U32, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 1);
return RESULT(U32, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 1);
return RESULT(U32, ParamCRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 2);
return RESULT(U64, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&>) {
MOZ_RELEASE_ASSERT(aIndex == 2);
return RESULT(U64, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 2);
return RESULT(U64, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&&>) {
MOZ_RELEASE_ASSERT(aIndex == 2);
return RESULT(U64, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
// Create a temporary variant by returning a copy of one.
auto CopyV = [](const V& aV) { return aV; };
// Create a temporary variant by returning a const copy of one.
auto CopyConstV = [](const V& aV) -> const V { return aV; };
MOZ_RELEASE_ASSERT(v1.match(desc) == RESULT(U8, ParamLREF, NA, 1));
MOZ_RELEASE_ASSERT(v2.match(desc) == RESULT(U32, ParamLREF, NA, 2));
MOZ_RELEASE_ASSERT(v3.match(desc) == RESULT(U64, ParamLREF, NA, 3));
MOZ_RELEASE_ASSERT(constRef1.match(desc) == RESULT(U8, ParamCLREF, NA, 1));
MOZ_RELEASE_ASSERT(constRef2.match(desc) == RESULT(U32, ParamCLREF, NA, 2));
MOZ_RELEASE_ASSERT(constRef3.match(desc) == RESULT(U64, ParamCLREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(desc) == RESULT(U8, ParamRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(desc) == RESULT(U32, ParamRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(desc) == RESULT(U64, ParamRREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(desc) ==
RESULT(U8, ParamCRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(desc) ==
RESULT(U32, ParamCRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(desc) ==
RESULT(U64, ParamCRREF, NA, 3));
}
static void testMatchingLambdas() {
printf("testMatchingLambdas\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
auto desc8 = [](auto&& a) {
if constexpr (std::is_same_v<decltype(a), uint8_t&>) {
return RESULT(U8, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&>) {
return RESULT(U8, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint8_t&&>) {
return RESULT(U8, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&&>) {
return RESULT(U8, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
auto desc32 = [](auto&& a) {
if constexpr (std::is_same_v<decltype(a), uint32_t&>) {
return RESULT(U32, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&>) {
return RESULT(U32, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&&>) {
return RESULT(U32, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&&>) {
return RESULT(U32, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
auto desc64 = [](auto&& a) {
if constexpr (std::is_same_v<decltype(a), uint64_t&>) {
return RESULT(U64, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&>) {
return RESULT(U64, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&&>) {
return RESULT(U64, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&&>) {
return RESULT(U64, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
// Create a temporary variant by returning a copy of one.
auto CopyV = [](const V& aV) { return aV; };
// Create a temporary variant by returning a const copy of one.
auto CopyConstV = [](const V& aV) -> const V { return aV; };
MOZ_RELEASE_ASSERT(v1.match(desc8, desc32, desc64) ==
RESULT(U8, ParamLREF, NA, 1));
MOZ_RELEASE_ASSERT(v2.match(desc8, desc32, desc64) ==
RESULT(U32, ParamLREF, NA, 2));
MOZ_RELEASE_ASSERT(v3.match(desc8, desc32, desc64) ==
RESULT(U64, ParamLREF, NA, 3));
MOZ_RELEASE_ASSERT(constRef1.match(desc8, desc32, desc64) ==
RESULT(U8, ParamCLREF, NA, 1));
MOZ_RELEASE_ASSERT(constRef2.match(desc8, desc32, desc64) ==
RESULT(U32, ParamCLREF, NA, 2));
MOZ_RELEASE_ASSERT(constRef3.match(desc8, desc32, desc64) ==
RESULT(U64, ParamCLREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(desc8, desc32, desc64) ==
RESULT(U8, ParamRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(desc8, desc32, desc64) ==
RESULT(U32, ParamRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(desc8, desc32, desc64) ==
RESULT(U64, ParamRREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(desc8, desc32, desc64) ==
RESULT(U8, ParamCRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(desc8, desc32, desc64) ==
RESULT(U32, ParamCRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(desc8, desc32, desc64) ==
RESULT(U64, ParamCRREF, NA, 3));
}
static void testMatchingLambdasWithIndex() {
printf("testMatchingLambdasWithIndex\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
auto desc8 = [](size_t aIndex, auto&& a) {
MOZ_RELEASE_ASSERT(aIndex == 0);
if constexpr (std::is_same_v<decltype(a), uint8_t&>) {
return RESULT(U8, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&>) {
return RESULT(U8, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint8_t&&>) {
return RESULT(U8, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint8_t&&>) {
return RESULT(U8, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
auto desc32 = [](size_t aIndex, auto&& a) {
MOZ_RELEASE_ASSERT(aIndex == 1);
if constexpr (std::is_same_v<decltype(a), uint32_t&>) {
return RESULT(U32, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&>) {
return RESULT(U32, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint32_t&&>) {
return RESULT(U32, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint32_t&&>) {
return RESULT(U32, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
auto desc64 = [](size_t aIndex, auto&& a) {
MOZ_RELEASE_ASSERT(aIndex == 2);
if constexpr (std::is_same_v<decltype(a), uint64_t&>) {
return RESULT(U64, ParamLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&>) {
return RESULT(U64, ParamCLREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), uint64_t&&>) {
return RESULT(U64, ParamRREF, NA, a);
} else if constexpr (std::is_same_v<decltype(a), const uint64_t&&>) {
return RESULT(U64, ParamCRREF, NA, a);
} else {
// We don't expect any other type.
// Tech note: We can't just do `static_assert(false)` which would always
// fail during the initial parsing. So we depend on the templated
// parameter to delay computing `false` until actual instantiation.
static_assert(sizeof(a) == size_t(-1));
return RESULT(NA, NA, NA, 0);
}
};
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
// Create a temporary variant by returning a copy of one.
auto CopyV = [](const V& aV) { return aV; };
// Create a temporary variant by returning a const copy of one.
auto CopyConstV = [](const V& aV) -> const V { return aV; };
MOZ_RELEASE_ASSERT(v1.match(desc8, desc32, desc64) ==
RESULT(U8, ParamLREF, NA, 1));
MOZ_RELEASE_ASSERT(v2.match(desc8, desc32, desc64) ==
RESULT(U32, ParamLREF, NA, 2));
MOZ_RELEASE_ASSERT(v3.match(desc8, desc32, desc64) ==
RESULT(U64, ParamLREF, NA, 3));
MOZ_RELEASE_ASSERT(constRef1.match(desc8, desc32, desc64) ==
RESULT(U8, ParamCLREF, NA, 1));
MOZ_RELEASE_ASSERT(constRef2.match(desc8, desc32, desc64) ==
RESULT(U32, ParamCLREF, NA, 2));
MOZ_RELEASE_ASSERT(constRef3.match(desc8, desc32, desc64) ==
RESULT(U64, ParamCLREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyV(v1).match(desc8, desc32, desc64) ==
RESULT(U8, ParamRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyV(v2).match(desc8, desc32, desc64) ==
RESULT(U32, ParamRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyV(v3).match(desc8, desc32, desc64) ==
RESULT(U64, ParamRREF, NA, 3));
MOZ_RELEASE_ASSERT(CopyConstV(v1).match(desc8, desc32, desc64) ==
RESULT(U8, ParamCRREF, NA, 1));
MOZ_RELEASE_ASSERT(CopyConstV(v2).match(desc8, desc32, desc64) ==
RESULT(U32, ParamCRREF, NA, 2));
MOZ_RELEASE_ASSERT(CopyConstV(v3).match(desc8, desc32, desc64) ==
RESULT(U64, ParamCRREF, NA, 3));
}
#undef RESULT
static void testAddTagToHash() {
printf("testAddToHash\n");
using V = Variant<uint8_t, uint16_t, uint32_t, uint64_t>;
// We don't know what our hash function is, and these are certainly not all
// true under all hash functions. But they are probably true under almost any
// decent hash function, and our aim is simply to establish that the tag
// *does* influence the hash value.
{
mozilla::HashNumber h8 = V(uint8_t(1)).addTagToHash(0);
mozilla::HashNumber h16 = V(uint16_t(1)).addTagToHash(0);
mozilla::HashNumber h32 = V(uint32_t(1)).addTagToHash(0);
mozilla::HashNumber h64 = V(uint64_t(1)).addTagToHash(0);
MOZ_RELEASE_ASSERT(h8 != h16 && h8 != h32 && h8 != h64);
MOZ_RELEASE_ASSERT(h16 != h32 && h16 != h64);
MOZ_RELEASE_ASSERT(h32 != h64);
}
{
mozilla::HashNumber h8 = V(uint8_t(1)).addTagToHash(0x124356);
mozilla::HashNumber h16 = V(uint16_t(1)).addTagToHash(0x124356);
mozilla::HashNumber h32 = V(uint32_t(1)).addTagToHash(0x124356);
mozilla::HashNumber h64 = V(uint64_t(1)).addTagToHash(0x124356);
MOZ_RELEASE_ASSERT(h8 != h16 && h8 != h32 && h8 != h64);
MOZ_RELEASE_ASSERT(h16 != h32 && h16 != h64);
MOZ_RELEASE_ASSERT(h32 != h64);
}
}
int main() {
testDetails();
testSimple();
testDuplicate();
testConstructionWithVariantType();
testConstructionWithVariantIndex();
testEmplaceWithType();
testEmplaceWithIndex();
testCopy();
testMove();
testDestructor();
testEquality();
testMatching();
testMatchingLambda();
testMatchingLambdaWithIndex();
testMatchingLambdas();
testMatchingLambdasWithIndex();
testAddTagToHash();
printf("TestVariant OK!\n");
return 0;
}
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