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// { dg-do compile { target c++20 } }
// { dg-require-effective-target cxx11_abi }
// { dg-add-options no_pch }
#include <string>
#ifndef __cpp_lib_constexpr_string
# error "Feature-test macro for constexpr std::string missing in <string>"
#elif __cpp_lib_constexpr_string != 201907L
# error "Feature-test macro for constexpr std::string has wrong value in <string>"
#endif
#include <testsuite_hooks.h>
using C = char;
using T = std::char_traits<C>;
template<typename T>
struct Alloc : std::allocator<T>
{
using std::allocator<T>::allocator;
constexpr explicit Alloc(int p) : personality(p) { }
template<typename U>
constexpr Alloc(const Alloc<U>& a) : personality(a.personality) { }
int personality = 0;
constexpr Alloc select_on_container_copy_construction() const
{ return Alloc(-1); }
constexpr bool operator==(const Alloc& a) const noexcept
{ return personality == a.personality; }
};
constexpr bool
test_default_ctor()
{
std::basic_string<C> s0;
VERIFY( s0.empty() );
std::basic_string<C> s1(std::allocator<C>{});
VERIFY( s1.empty() );
std::basic_string<C, T, Alloc<C>> s2;
VERIFY( s2.empty() );
std::basic_string<C, T, Alloc<C>> s3(Alloc<C>(3));
VERIFY( s3.empty() );
VERIFY( s3.get_allocator().personality == 3 );
return true;
}
static_assert( test_default_ctor() );
constexpr bool
test_cstr()
{
const C cs[] = "This has an embedded \0 null";
const auto len = (sizeof(cs) - 1)/sizeof(C);
std::basic_string<C> s1(cs);
VERIFY( s1.length() == 21 );
std::basic_string<C> s2(cs, std::allocator<C>{});
VERIFY( s2 == s1 );
std::basic_string<C> s3(cs, len);
VERIFY( s3.length() == len );
VERIFY( s3[len] == '\0' );
std::basic_string<C> s4(cs, len, std::allocator<C>{});
VERIFY( s4 == s3 );
std::basic_string<C, T, Alloc<C>> s5(cs);
VERIFY( s5 == std::basic_string_view<C>(s1) );
std::basic_string<C, T, Alloc<C>> s6(cs, Alloc<C>(6));
VERIFY( s6 == std::basic_string_view<C>(s1) );
VERIFY( s6.get_allocator().personality == 6 );
std::basic_string<C, T, Alloc<C>> s7(cs, len, Alloc<C>(7));
VERIFY( s7 == std::basic_string_view<C>(s3) );
VERIFY( s7.get_allocator().personality == 7 );
return true;
}
static_assert( test_cstr() );
constexpr bool
test_copy()
{
const std::basic_string<C> short_string = "sh";
const std::basic_string<C> long_string = "string longer than the SSO buffer";
std::basic_string<C> s1 = short_string;
VERIFY( s1 == short_string );
std::basic_string<C> s2(short_string, s1.get_allocator());
VERIFY( s2 == short_string );
std::basic_string<C> s3 = long_string;
VERIFY( s3 == long_string );
std::basic_string<C> s4(long_string, s1.get_allocator());
VERIFY( s4 == long_string );
std::basic_string<C, T, Alloc<C>> a_short_string = short_string.c_str();
std::basic_string<C, T, Alloc<C>> a_long_string = long_string.c_str();
std::basic_string<C, T, Alloc<C>> s5(a_short_string);
VERIFY( s5 == a_short_string );
std::basic_string<C, T, Alloc<C>> s6(a_short_string, s5.get_allocator());
VERIFY( s6 == a_short_string );
std::basic_string<C, T, Alloc<C>> s7(a_short_string, Alloc<C>(7));
VERIFY( s7 == a_short_string );
VERIFY( s7.get_allocator().personality == 7 );
std::basic_string<C, T, Alloc<C>> s8 = a_long_string;
VERIFY( s8 == a_long_string );
std::basic_string<C, T, Alloc<C>> s9(a_long_string, s5.get_allocator());
VERIFY( s9 == a_long_string );
std::basic_string<C, T, Alloc<C>> s10(a_long_string, Alloc<C>(10));
VERIFY( s10 == a_long_string );
VERIFY( s10.get_allocator().personality == 10 );
return true;
}
static_assert( test_copy() );
constexpr bool
test_move()
{
const std::basic_string<C> short_string = "sh";
const std::basic_string<C> long_string = "string longer than the SSO buffer";
std::basic_string<C> s0 = short_string;
std::basic_string<C> s1 = std::move(s0);
VERIFY( s1 == short_string );
std::basic_string<C> s2(std::move(s1), std::allocator<C>());
VERIFY( s2 == short_string );
s0 = long_string;
std::basic_string<C> s3 = std::move(s0);
VERIFY( s3 == long_string );
std::basic_string<C> s4(std::move(s3), s1.get_allocator());
VERIFY( s4 == long_string );
std::basic_string<C, T, Alloc<C>> a_short_string = short_string.c_str();
std::basic_string<C, T, Alloc<C>> a_long_string = long_string.c_str();
auto sa0 = a_short_string;
std::basic_string<C, T, Alloc<C>> s5 = std::move(sa0);
VERIFY( s5 == a_short_string );
std::basic_string<C, T, Alloc<C>> s6(std::move(s5), sa0.get_allocator());
VERIFY( s6 == a_short_string );
std::basic_string<C, T, Alloc<C>> s7(std::move(s6), Alloc<C>(7));
VERIFY( s7 == a_short_string );
VERIFY( s7.get_allocator().personality == 7 );
sa0 = a_long_string;
std::basic_string<C, T, Alloc<C>> s8 = std::move(sa0);
VERIFY( s8 == a_long_string );
std::basic_string<C, T, Alloc<C>> s9(std::move(s8), s5.get_allocator());
VERIFY( s9 == a_long_string );
std::basic_string<C, T, Alloc<C>> s10(std::move(s9), Alloc<C>(10));
VERIFY( s10 == a_long_string );
VERIFY( s10.get_allocator().personality == 10 );
return true;
}
static_assert( test_move() );
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