front.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <string>
// const charT& front() const;
// charT& front();
#ifdef _LIBCPP_DEBUG
#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
#endif
#include <string>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
template <class S>
void
test(S s)
{
const S& cs = s;
ASSERT_SAME_TYPE(decltype( s.front()), typename S::reference);
ASSERT_SAME_TYPE(decltype(cs.front()), typename S::const_reference);
LIBCPP_ASSERT_NOEXCEPT( s.front());
LIBCPP_ASSERT_NOEXCEPT( cs.front());
assert(&cs.front() == &cs[0]);
assert(&s.front() == &s[0]);
s.front() = typename S::value_type('z');
assert(s.front() == typename S::value_type('z'));
}
int main(int, char**)
{
{
typedef std::string S;
test(S("1"));
test(S("1234567890123456789012345678901234567890"));
}
#if TEST_STD_VER >= 11
{
typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
test(S("1"));
test(S("1234567890123456789012345678901234567890"));
}
#endif
#ifdef _LIBCPP_DEBUG
{
std::string s;
(void) s.front();
assert(false);
}
#endif
return 0;
}