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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<ForwardIterator Iter, class T>
// constexpr bool // constexpr after C++17
// binary_search(Iter first, Iter last, const T& value);
#include <algorithm>
#include <vector>
#include <cassert>
#include <cstddef>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool lt(int a, int b) { return a < b; }
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 3, 6, 7};
return std::binary_search(std::begin(ia), std::end(ia), 1)
&& std::binary_search(std::begin(ia), std::end(ia), 3)
&& !std::binary_search(std::begin(ia), std::end(ia), 9)
;
}
#endif
template <class Iter, class T>
void
test(Iter first, Iter last, const T& value, bool x)
{
assert(std::binary_search(first, last, value) == x);
}
template <class Iter>
void
test()
{
const unsigned N = 1000;
const int M = 10;
std::vector<int> v(N);
int x = 0;
for (std::size_t i = 0; i < v.size(); ++i)
{
v[i] = x;
if (++x == M)
x = 0;
}
std::sort(v.begin(), v.end());
for (x = 0; x < M; ++x)
test(Iter(v.data()), Iter(v.data()+v.size()), x, true);
test(Iter(v.data()), Iter(v.data()+v.size()), -1, false);
test(Iter(v.data()), Iter(v.data()+v.size()), M, false);
}
int main()
{
int d[] = {0, 2, 4, 6};
for (int* e = d; e <= d+4; ++e)
for (int x = -1; x <= 7; ++x)
test(d, e, x, (x % 2 == 0) && ((e-d)*2 > x));
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}
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