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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>
// void push_back(charT c) // constexpr since C++20
#include <string>
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
struct VeryLarge {
long long a;
char b;
};
namespace std {
template <>
struct char_traits<VeryLarge> {
using char_type = VeryLarge;
using int_type = int;
using off_type = streamoff;
using pos_type = streampos;
using state_type = mbstate_t;
static TEST_CONSTEXPR_CXX20 void assign(char_type& c1, const char_type& c2) { c1 = c2; }
static bool eq(char_type c1, char_type c2);
static bool lt(char_type c1, char_type c2);
static int compare(const char_type* s1, const char_type* s2, size_t n);
static size_t length(const char_type* s);
static const char_type* find(const char_type* s, size_t n, const char_type& a);
static char_type* move(char_type* s1, const char_type* s2, size_t n);
static TEST_CONSTEXPR_CXX20 char_type* copy(char_type* s1, const char_type* s2, size_t n) {
std::copy_n(s2, n, s1);
return s1;
}
static TEST_CONSTEXPR_CXX20 char_type* assign(char_type* s, size_t n, char_type a) {
std::fill_n(s, n, a);
return s;
}
static int_type not_eof(int_type c);
static char_type to_char_type(int_type c);
static int_type to_int_type(char_type c);
static bool eq_int_type(int_type c1, int_type c2);
static int_type eof();
};
} // end namespace std
template <class S>
TEST_CONSTEXPR_CXX20 void
test(S s, typename S::value_type c, S expected)
{
s.push_back(c);
LIBCPP_ASSERT(s.__invariants());
assert(s == expected);
}
TEST_CONSTEXPR_CXX20 bool test() {
{
typedef std::string S;
test(S(), 'a', S(1, 'a'));
test(S("12345"), 'a', S("12345a"));
test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
}
#if TEST_STD_VER >= 11
{
typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
test(S(), 'a', S(1, 'a'));
test(S("12345"), 'a', S("12345a"));
test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
}
#endif
{
// https://llvm.org/PR31454
std::basic_string<VeryLarge> s;
VeryLarge vl = {};
s.push_back(vl);
s.push_back(vl);
s.push_back(vl);
}
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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