xref: /llvm-project-15.0.7/libcxx/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp (revision 6d9f750d)

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <string>

// template<class InputIterator>
//   basic_string(InputIterator begin, InputIterator end,
//   const Allocator& a = Allocator());

// template<class InputIterator,
//      class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
//  basic_string(InputIterator, InputIterator, Allocator = Allocator())
//    -> basic_string<typename iterator_traits<InputIterator>::value_type,
//                 char_traits<typename iterator_traits<InputIterator>::value_type>,
//                 Allocator>;
//
//	The deduction guide shall not participate in overload resolution if InputIterator
//  is a type that does not qualify as an input iterator, or if Allocator is a type
//  that does not qualify as an allocator.


#include <string>
#include <iterator>
#include <cassert>
#include <cstddef>

#include "test_macros.h"
#include "test_allocator.h"
#include "../input_iterator.h"
#include "min_allocator.h"

template <class It>
void
test(It first, It last)
{
    typedef typename std::iterator_traits<It>::value_type charT;
    typedef std::basic_string<charT, std::char_traits<charT>, test_allocator<charT> > S;
    typedef typename S::allocator_type A;
    S s2(first, last);
    LIBCPP_ASSERT(s2.__invariants());
    assert(s2.size() == static_cast<std::size_t>(std::distance(first, last)));
    unsigned i = 0;
    for (It it = first; it != last; ++it, ++i)
        assert(s2[i] == *it);
    assert(s2.get_allocator() == A());
    assert(s2.capacity() >= s2.size());
}

template <class It, class A>
void
test(It first, It last, const A& a)
{
    typedef typename std::iterator_traits<It>::value_type charT;
    typedef std::basic_string<charT, std::char_traits<charT>, A> S;
    S s2(first, last, a);
    LIBCPP_ASSERT(s2.__invariants());
    assert(s2.size() == static_cast<std::size_t>(std::distance(first, last)));
    unsigned i = 0;
    for (It it = first; it != last; ++it, ++i)
        assert(s2[i] == *it);
    assert(s2.get_allocator() == a);
    assert(s2.capacity() >= s2.size());
}

int main()
{
    {
    typedef test_allocator<char> A;
    const char* s = "12345678901234567890123456789012345678901234567890";

    test(s, s);
    test(s, s, A(2));

    test(s, s+1);
    test(s, s+1, A(2));

    test(s, s+10);
    test(s, s+10, A(2));

    test(s, s+50);
    test(s, s+50, A(2));

    test(input_iterator<const char*>(s), input_iterator<const char*>(s));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s), A(2));

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+1));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+1), A(2));

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+10));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), A(2));

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+50));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+50), A(2));
    }
#if TEST_STD_VER >= 11
    {
    typedef min_allocator<char> A;
    const char* s = "12345678901234567890123456789012345678901234567890";

    test(s, s);
    test(s, s, A());

    test(s, s+1);
    test(s, s+1, A());

    test(s, s+10);
    test(s, s+10, A());

    test(s, s+50);
    test(s, s+50, A());

    test(input_iterator<const char*>(s), input_iterator<const char*>(s));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s), A());

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+1));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+1), A());

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+10));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), A());

    test(input_iterator<const char*>(s), input_iterator<const char*>(s+50));
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+50), A());
    }
#endif

//  Test deduction guides
#if TEST_STD_VER > 14
    {
    const char* s = "12345678901234";
    std::basic_string s1{s, s+10, std::allocator<char>{}};
    using S = decltype(s1); // what type did we get?
    static_assert(std::is_same_v<S::value_type,                      char>,  "");
    static_assert(std::is_same_v<S::traits_type,    std::char_traits<char>>, "");
    static_assert(std::is_same_v<S::allocator_type,   std::allocator<char>>, "");
    assert(s1.size() == 10);
    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
    }
    {
    const wchar_t* s = L"12345678901234";
    std::basic_string s1{s, s+10, test_allocator<wchar_t>{}};
    using S = decltype(s1); // what type did we get?
    static_assert(std::is_same_v<S::value_type,                      wchar_t>,  "");
    static_assert(std::is_same_v<S::traits_type,    std::char_traits<wchar_t>>, "");
    static_assert(std::is_same_v<S::allocator_type,   test_allocator<wchar_t>>, "");
    assert(s1.size() == 10);
    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
    }
    {
    const char16_t* s = u"12345678901234";
    std::basic_string s1{s, s+10, min_allocator<char16_t>{}};
    using S = decltype(s1); // what type did we get?
    static_assert(std::is_same_v<S::value_type,                      char16_t>,  "");
    static_assert(std::is_same_v<S::traits_type,    std::char_traits<char16_t>>, "");
    static_assert(std::is_same_v<S::allocator_type,    min_allocator<char16_t>>, "");
    assert(s1.size() == 10);
    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
    }
    {
    const char32_t* s = U"12345678901234";
    std::basic_string s1{s, s+10, explicit_allocator<char32_t>{}};
    using S = decltype(s1); // what type did we get?
    static_assert(std::is_same_v<S::value_type,                        char32_t>,  "");
    static_assert(std::is_same_v<S::traits_type,      std::char_traits<char32_t>>, "");
    static_assert(std::is_same_v<S::allocator_type, explicit_allocator<char32_t>>, "");
    assert(s1.size() == 10);
    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
    }
#endif
}