gecko-dev/mfbt/tests/TestBinarySearch.cpp
Luke Wagner 73f0ab2246 Bug 998507 - add BinarySearch (r=sunfish)
--HG--
extra : rebase_source : 6ba04575a5dd8a886235e6799bc790c7a3afc64f
2014-04-15 21:30:26 -05:00

76 lines
2.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/Assertions.h"
#include "mozilla/BinarySearch.h"
#include "mozilla/Vector.h"
using mozilla::Vector;
using mozilla::BinarySearch;
struct Person
{
int age;
int id;
Person(int age, int id) : age(age), id(id) {}
};
struct GetAge
{
Vector<Person> &v;
GetAge(Vector<Person> &v) : v(v) {}
int operator[](size_t index) const { return v[index].age; }
};
int main()
{
size_t m;
Vector<int> v1;
v1.append(2);
v1.append(4);
v1.append(6);
v1.append(8);
MOZ_ASSERT(!BinarySearch(v1, 0, v1.length(), 1, &m) && m == 0);
MOZ_ASSERT( BinarySearch(v1, 0, v1.length(), 2, &m) && m == 0);
MOZ_ASSERT(!BinarySearch(v1, 0, v1.length(), 3, &m) && m == 1);
MOZ_ASSERT( BinarySearch(v1, 0, v1.length(), 4, &m) && m == 1);
MOZ_ASSERT(!BinarySearch(v1, 0, v1.length(), 5, &m) && m == 2);
MOZ_ASSERT( BinarySearch(v1, 0, v1.length(), 6, &m) && m == 2);
MOZ_ASSERT(!BinarySearch(v1, 0, v1.length(), 7, &m) && m == 3);
MOZ_ASSERT( BinarySearch(v1, 0, v1.length(), 8, &m) && m == 3);
MOZ_ASSERT(!BinarySearch(v1, 0, v1.length(), 9, &m) && m == 4);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 1, &m) && m == 1);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 2, &m) && m == 1);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 3, &m) && m == 1);
MOZ_ASSERT( BinarySearch(v1, 1, 3, 4, &m) && m == 1);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 5, &m) && m == 2);
MOZ_ASSERT( BinarySearch(v1, 1, 3, 6, &m) && m == 2);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 7, &m) && m == 3);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 8, &m) && m == 3);
MOZ_ASSERT(!BinarySearch(v1, 1, 3, 9, &m) && m == 3);
MOZ_ASSERT(!BinarySearch(v1, 0, 0, 0, &m) && m == 0);
MOZ_ASSERT(!BinarySearch(v1, 0, 0, 9, &m) && m == 0);
Vector<int> v2;
MOZ_ASSERT(!BinarySearch(v2, 0, 0, 0, &m) && m == 0);
MOZ_ASSERT(!BinarySearch(v2, 0, 0, 9, &m) && m == 0);
Vector<Person> v3;
v3.append(Person(2, 42));
v3.append(Person(4, 13));
v3.append(Person(6, 360));
MOZ_ASSERT(!BinarySearch(GetAge(v3), 0, v3.length(), 1, &m) && m == 0);
MOZ_ASSERT( BinarySearch(GetAge(v3), 0, v3.length(), 2, &m) && m == 0);
MOZ_ASSERT(!BinarySearch(GetAge(v3), 0, v3.length(), 3, &m) && m == 1);
MOZ_ASSERT( BinarySearch(GetAge(v3), 0, v3.length(), 4, &m) && m == 1);
MOZ_ASSERT(!BinarySearch(GetAge(v3), 0, v3.length(), 5, &m) && m == 2);
MOZ_ASSERT( BinarySearch(GetAge(v3), 0, v3.length(), 6, &m) && m == 2);
MOZ_ASSERT(!BinarySearch(GetAge(v3), 0, v3.length(), 7, &m) && m == 3);
}