Louis Dionne 6e1dcc9335 [libc++] Refactor string unit tests to ease addition of new allocators
While doing this, I also found a few tests that were either clearly
incorrect (e.g. testing the wrong function) or that lacked basic test
coverage like testing std::string itself (e.g. the test was only checking
std::basic_string with a custom allocator). In these cases, I did a few
conservative drive-by changes.

Differential Revision: https://reviews.llvm.org/D140550
Co-authored-by: Brendan Emery <brendan.emery@esrlabs.com>
2023-09-27 09:01:58 -04:00

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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>
// basic_string(const charT* s, const Allocator& a = Allocator()); // constexpr since C++20
#include <string>
#include <stdexcept>
#include <algorithm>
#include <cassert>
#include <cstddef>
#include "test_macros.h"
#include "test_allocator.h"
#include "min_allocator.h"
template <class Alloc, class charT>
TEST_CONSTEXPR_CXX20 void test(const charT* s) {
typedef std::basic_string<charT, std::char_traits<charT>, Alloc> S;
typedef typename S::traits_type T;
std::size_t n = T::length(s);
S s2(s);
LIBCPP_ASSERT(s2.__invariants());
assert(s2.size() == n);
assert(T::compare(s2.data(), s, n) == 0);
assert(s2.get_allocator() == Alloc());
assert(s2.capacity() >= s2.size());
}
template <class Alloc, class charT>
TEST_CONSTEXPR_CXX20 void test(const charT* s, const Alloc& a) {
typedef std::basic_string<charT, std::char_traits<charT>, Alloc> S;
typedef typename S::traits_type T;
std::size_t n = T::length(s);
S s2(s, a);
LIBCPP_ASSERT(s2.__invariants());
assert(s2.size() == n);
assert(T::compare(s2.data(), s, n) == 0);
assert(s2.get_allocator() == a);
assert(s2.capacity() >= s2.size());
}
template <class Alloc>
TEST_CONSTEXPR_CXX20 void test(const Alloc& a) {
test<Alloc>("");
test<Alloc>("", Alloc(a));
test<Alloc>("1");
test<Alloc>("1", Alloc(a));
test<Alloc>("1234567980");
test<Alloc>("1234567980", Alloc(a));
test<Alloc>("123456798012345679801234567980123456798012345679801234567980");
test<Alloc>("123456798012345679801234567980123456798012345679801234567980", Alloc(a));
}
TEST_CONSTEXPR_CXX20 bool test() {
test(std::allocator<char>());
test(test_allocator<char>());
test(test_allocator<char>(2));
#if TEST_STD_VER >= 11
test(min_allocator<char>());
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}