gecko-dev/mfbt/tests/TestTuple.cpp
2020-03-31 12:36:22 +00:00

311 lines
7.3 KiB
C++

/* -*- 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 <stddef.h>
#include <type_traits>
#include <utility>
#include "mozilla/Assertions.h"
#include "mozilla/CompactPair.h"
#include "mozilla/Tuple.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
using mozilla::CompactPair;
using mozilla::Get;
using mozilla::MakeTuple;
using mozilla::MakeUnique;
using mozilla::Tie;
using mozilla::Tuple;
using mozilla::UniquePtr;
using mozilla::Unused;
using std::pair;
#define CHECK(c) \
do { \
bool cond = !!(c); \
MOZ_RELEASE_ASSERT(cond, "Failed assertion: " #c); \
} while (false)
// The second argument is the expected type. It's variadic to allow the
// type to contain commas.
#define CHECK_TYPE(expression, ...) \
static_assert(std::is_same_v<decltype(expression), __VA_ARGS__>, \
"Type mismatch!")
struct ConvertibleToInt {
operator int() const { return 42; }
};
static void TestConstruction() {
// Default construction
Tuple<> a;
Unused << a;
Tuple<int> b;
Unused << b;
// Construction from elements
int x = 1, y = 1;
Tuple<int, int> c{x, y};
Tuple<int&, const int&> d{x, y};
x = 42;
y = 42;
CHECK(Get<0>(c) == 1);
CHECK(Get<1>(c) == 1);
CHECK(Get<0>(d) == 42);
CHECK(Get<1>(d) == 42);
// Construction from objects convertible to the element types
Tuple<int, int> e{1.0, ConvertibleToInt{}};
// Copy construction
Tuple<int> x1;
Tuple<int> x2{x1};
Tuple<int, int> f(c);
CHECK(Get<0>(f) == 1);
CHECK(Get<0>(f) == 1);
// Move construction
Tuple<UniquePtr<int>> g{MakeUnique<int>(42)};
Tuple<UniquePtr<int>> h{std::move(g)};
CHECK(Get<0>(g) == nullptr);
CHECK(*Get<0>(h) == 42);
}
static void TestConstructionFromMozPair() {
// Construction from elements
int x = 1, y = 1;
CompactPair<int, int> a{x, y};
CompactPair<int&, const int&> b{x, y};
Tuple<int, int> c(a);
Tuple<int&, const int&> d(b);
x = 42;
y = 42;
CHECK(Get<0>(c) == 1);
CHECK(Get<1>(c) == 1);
CHECK(Get<0>(d) == 42);
CHECK(Get<1>(d) == 42);
}
static void TestConstructionFromStdPair() {
// Construction from elements
int x = 1, y = 1;
pair<int, int> a{x, y};
pair<int&, const int&> b{x, y};
Tuple<int, int> c(a);
Tuple<int&, const int&> d(b);
x = 42;
y = 42;
CHECK(Get<0>(c) == 1);
CHECK(Get<1>(c) == 1);
CHECK(Get<0>(d) == 42);
CHECK(Get<1>(d) == 42);
}
static void TestAssignment() {
// Copy assignment
Tuple<int> a{0};
Tuple<int> b{42};
a = b;
CHECK(Get<0>(a) == 42);
// Assignment to reference member
int i = 0;
int j = 42;
Tuple<int&> c{i};
Tuple<int&> d{j};
c = d;
CHECK(i == 42);
// Move assignment
Tuple<UniquePtr<int>> e{MakeUnique<int>(0)};
Tuple<UniquePtr<int>> f{MakeUnique<int>(42)};
e = std::move(f);
CHECK(*Get<0>(e) == 42);
CHECK(Get<0>(f) == nullptr);
}
static void TestAssignmentFromMozPair() {
// Copy assignment
Tuple<int, int> a{0, 0};
CompactPair<int, int> b{42, 42};
a = b;
CHECK(Get<0>(a) == 42);
CHECK(Get<1>(a) == 42);
// Assignment to reference member
int i = 0;
int j = 0;
int k = 42;
Tuple<int&, int&> c{i, j};
CompactPair<int&, int&> d{k, k};
c = d;
CHECK(i == 42);
CHECK(j == 42);
// Move assignment
Tuple<UniquePtr<int>, UniquePtr<int>> e{MakeUnique<int>(0),
MakeUnique<int>(0)};
CompactPair<UniquePtr<int>, UniquePtr<int>> f{MakeUnique<int>(42),
MakeUnique<int>(42)};
e = std::move(f);
CHECK(*Get<0>(e) == 42);
CHECK(*Get<1>(e) == 42);
CHECK(f.first() == nullptr);
CHECK(f.second() == nullptr);
}
static void TestAssignmentFromStdPair() {
// Copy assignment
Tuple<int, int> a{0, 0};
pair<int, int> b{42, 42};
a = b;
CHECK(Get<0>(a) == 42);
CHECK(Get<1>(a) == 42);
// Assignment to reference member
int i = 0;
int j = 0;
int k = 42;
Tuple<int&, int&> c{i, j};
pair<int&, int&> d{k, k};
c = d;
CHECK(i == 42);
CHECK(j == 42);
// Move assignment.
Tuple<UniquePtr<int>, UniquePtr<int>> e{MakeUnique<int>(0),
MakeUnique<int>(0)};
// XXX: On some platforms std::pair doesn't support move constructor.
pair<UniquePtr<int>, UniquePtr<int>> f;
f.first = MakeUnique<int>(42);
f.second = MakeUnique<int>(42);
e = std::move(f);
CHECK(*Get<0>(e) == 42);
CHECK(*Get<1>(e) == 42);
CHECK(f.first == nullptr);
CHECK(f.second == nullptr);
}
static void TestGet() {
int x = 1;
int y = 2;
int z = 3;
Tuple<int, int&, const int&> tuple(x, y, z);
// Using Get<>() to read elements
CHECK(Get<0>(tuple) == 1);
CHECK(Get<1>(tuple) == 2);
CHECK(Get<2>(tuple) == 3);
// Using Get<>() to write to elements
Get<0>(tuple) = 41;
CHECK(Get<0>(tuple) == 41);
// Writing through reference elements
Get<1>(tuple) = 42;
CHECK(Get<1>(tuple) == 42);
CHECK(y == 42);
}
static void TestMakeTuple() {
auto tuple = MakeTuple(42, 0.5f, 'c');
CHECK_TYPE(tuple, Tuple<int, float, char>);
CHECK(Get<0>(tuple) == 42);
CHECK(Get<1>(tuple) == 0.5f);
CHECK(Get<2>(tuple) == 'c');
// Make sure we don't infer the type to be Tuple<int&>.
int x = 1;
auto tuple2 = MakeTuple(x);
CHECK_TYPE(tuple2, Tuple<int>);
x = 2;
CHECK(Get<0>(tuple2) == 1);
}
static bool TestTieMozPair() {
int i;
float f;
char c;
Tuple<int, float, char> rhs1(42, 0.5f, 'c');
Tie(i, f, c) = rhs1;
CHECK(i == Get<0>(rhs1));
CHECK(f == Get<1>(rhs1));
CHECK(c == Get<2>(rhs1));
// Test conversions
Tuple<ConvertibleToInt, double, unsigned char> rhs2(ConvertibleToInt(), 0.7f,
'd');
Tie(i, f, c) = rhs2;
CHECK(i == Get<0>(rhs2));
CHECK(f == Get<1>(rhs2));
CHECK(c == Get<2>(rhs2));
// Test Pair
CompactPair<int, float> rhs3(42, 1.5f);
Tie(i, f) = rhs3;
CHECK(i == rhs3.first());
CHECK(f == rhs3.second());
return true;
}
static bool TestTie() {
int i;
float f;
char c;
Tuple<int, float, char> rhs1(42, 0.5f, 'c');
Tie(i, f, c) = rhs1;
CHECK(i == Get<0>(rhs1));
CHECK(f == Get<1>(rhs1));
CHECK(c == Get<2>(rhs1));
// Test conversions
Tuple<ConvertibleToInt, double, unsigned char> rhs2(ConvertibleToInt(), 0.7f,
'd');
Tie(i, f, c) = rhs2;
CHECK(i == Get<0>(rhs2));
CHECK(f == Get<1>(rhs2));
CHECK(c == Get<2>(rhs2));
// Test Pair
pair<int, float> rhs3(42, 1.5f);
Tie(i, f) = rhs3;
CHECK(i == rhs3.first);
CHECK(f == rhs3.second);
return true;
}
static bool TestTieIgnore() {
int i;
char c;
Tuple<int, float, char> rhs1(42, 0.5f, 'c');
Tie(i, mozilla::Ignore, c) = rhs1;
CHECK(i == Get<0>(rhs1));
CHECK(c == Get<2>(rhs1));
return true;
}
int main() {
TestConstruction();
TestConstructionFromMozPair();
TestConstructionFromStdPair();
TestAssignment();
TestAssignmentFromMozPair();
TestAssignmentFromStdPair();
TestGet();
TestMakeTuple();
TestTie();
TestTieIgnore();
TestTieMozPair();
return 0;
}