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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_reference at(size_type pos) const; // constexpr since C++20
// reference at(size_type pos); // constexpr since C++20
#include <string>
#include <stdexcept>
#include <cassert>
#include "min_allocator.h"
#include "make_string.h"
#include "test_macros.h"
#include "type_algorithms.h"
template <class S>
TEST_CONSTEXPR_CXX20 void
test(S s, typename S::size_type pos)
{
const S& cs = s;
if (pos < s.size())
{
assert(s.at(pos) == s[pos]);
assert(cs.at(pos) == cs[pos]);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
else if (!TEST_IS_CONSTANT_EVALUATED)
{
try
{
TEST_IGNORE_NODISCARD s.at(pos);
assert(false);
}
catch (std::out_of_range&)
{
assert(pos >= s.size());
}
try
{
TEST_IGNORE_NODISCARD cs.at(pos);
assert(false);
}
catch (std::out_of_range&)
{
assert(pos >= s.size());
}
}
#endif
}
template <class S>
TEST_CONSTEXPR_CXX20 void test_string() {
test(S(), 0);
test(S(MAKE_CSTRING(typename S::value_type, "123")), 0);
test(S(MAKE_CSTRING(typename S::value_type, "123")), 1);
test(S(MAKE_CSTRING(typename S::value_type, "123")), 2);
test(S(MAKE_CSTRING(typename S::value_type, "123")), 3);
}
struct TestCaller {
template <class T>
TEST_CONSTEXPR_CXX20 void operator()() {
test_string<std::basic_string<T> >();
#if TEST_STD_VER >= 11
test_string<std::basic_string<T, std::char_traits<T>, min_allocator<T> > >();
#endif
}
};
TEST_CONSTEXPR_CXX20 bool test() {
types::for_each(types::character_types(), TestCaller());
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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