xref: /llvm-project-15.0.7/libcxx/test/std/strings/basic.string/string.cons/substr.pass.cpp (revision 1cf41139)

//===----------------------------------------------------------------------===//
//
// 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 basic_string<charT,traits,Allocator>& str,
//              size_type pos, size_type n,
//              const Allocator& a = Allocator()); // constexpr since C++20
//
// basic_string(const basic_string<charT,traits,Allocator>& str,
//              size_type pos,
//              const Allocator& a = Allocator()); // constexpr since C++20

#include <string>
#include <stdexcept>
#include <algorithm>
#include <vector>
#include <scoped_allocator>
#include <cassert>

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

template <class S>
TEST_CONSTEXPR_CXX20 void
test(S str, unsigned pos)
{
    typedef typename S::traits_type T;
    typedef typename S::allocator_type A;

    if (pos <= str.size())
    {
        S s2(str, pos);
        LIBCPP_ASSERT(s2.__invariants());
        typename S::size_type rlen = str.size() - pos;
        assert(s2.size() == rlen);
        assert(T::compare(s2.data(), str.data() + pos, rlen) == 0);
        assert(s2.get_allocator() == A());
        assert(s2.capacity() >= s2.size());
    }
#ifndef TEST_HAS_NO_EXCEPTIONS
    else if (!TEST_IS_CONSTANT_EVALUATED)
    {
        try
        {
            S s2(str, pos);
            assert(false);
        }
        catch (std::out_of_range&)
        {
            assert(pos > str.size());
        }
    }
#endif
}

template <class S>
TEST_CONSTEXPR_CXX20 void
test(S str, unsigned pos, unsigned n)
{
    typedef typename S::traits_type T;
    typedef typename S::allocator_type A;
    if (pos <= str.size())
    {
        S s2(str, pos, n);
        LIBCPP_ASSERT(s2.__invariants());
        typename S::size_type rlen = std::min<typename S::size_type>(str.size() - pos, n);
        assert(s2.size() == rlen);
        assert(T::compare(s2.data(), str.data() + pos, rlen) == 0);
        assert(s2.get_allocator() == A());
        assert(s2.capacity() >= s2.size());
    }
#ifndef TEST_HAS_NO_EXCEPTIONS
    else if (!TEST_IS_CONSTANT_EVALUATED)
    {
        try
        {
            S s2(str, pos, n);
            assert(false);
        }
        catch (std::out_of_range&)
        {
            assert(pos > str.size());
        }
    }
#endif
}

template <class S>
TEST_CONSTEXPR_CXX20 void
test(S str, unsigned pos, unsigned n, const typename S::allocator_type& a)
{
    typedef typename S::traits_type T;

    if (pos <= str.size())
    {
        S s2(str, pos, n, a);
        LIBCPP_ASSERT(s2.__invariants());
        typename S::size_type rlen = std::min<typename S::size_type>(str.size() - pos, n);
        assert(s2.size() == rlen);
        assert(T::compare(s2.data(), str.data() + pos, rlen) == 0);
        assert(s2.get_allocator() == a);
        assert(s2.capacity() >= s2.size());
    }
#ifndef TEST_HAS_NO_EXCEPTIONS
    else if (!TEST_IS_CONSTANT_EVALUATED)
    {
        try
        {
            S s2(str, pos, n, a);
            assert(false);
        }
        catch (std::out_of_range&)
        {
            assert(pos > str.size());
        }
    }
#endif
}

void test_lwg2583()
{
#if TEST_STD_VER >= 11 && !defined(TEST_HAS_NO_EXCEPTIONS)
    typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> StringA;
    std::vector<StringA, std::scoped_allocator_adaptor<test_allocator<StringA>>> vs;
    StringA s{"1234"};
    vs.emplace_back(s, 2);

    try { vs.emplace_back(s, 5); }
    catch (const std::out_of_range&) { return; }
    assert(false);
#endif
}

TEST_CONSTEXPR_CXX20 bool test() {
  {
    typedef test_allocator<char> A;
    typedef std::basic_string<char, std::char_traits<char>, A> S;

    test(S(A(3)), 0);
    test(S(A(3)), 1);
    test(S("1", A(5)), 0);
    test(S("1", A(5)), 1);
    test(S("1", A(5)), 2);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 0);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 5);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 500);

    test(S(A(3)), 0, 0);
    test(S(A(3)), 0, 1);
    test(S(A(3)), 1, 0);
    test(S(A(3)), 1, 1);
    test(S(A(3)), 1, 2);
    test(S("1", A(5)), 0, 0);
    test(S("1", A(5)), 0, 1);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 0);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 1);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 10);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 100);

    test(S(A(3)), 0, 0, A(4));
    test(S(A(3)), 0, 1, A(4));
    test(S(A(3)), 1, 0, A(4));
    test(S(A(3)), 1, 1, A(4));
    test(S(A(3)), 1, 2, A(4));
    test(S("1", A(5)), 0, 0, A(6));
    test(S("1", A(5)), 0, 1, A(6));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 0, A(8));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 1, A(8));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 10, A(8));
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), 50, 100, A(8));
  }
#if TEST_STD_VER >= 11
  {
    typedef min_allocator<char> A;
    typedef std::basic_string<char, std::char_traits<char>, A> S;

    test(S(A()), 0);
    test(S(A()), 1);
    test(S("1", A()), 0);
    test(S("1", A()), 1);
    test(S("1", A()), 2);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 0);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 5);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 500);

    test(S(A()), 0, 0);
    test(S(A()), 0, 1);
    test(S(A()), 1, 0);
    test(S(A()), 1, 1);
    test(S(A()), 1, 2);
    test(S("1", A()), 0, 0);
    test(S("1", A()), 0, 1);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 0);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 1);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 10);
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 100);

    test(S(A()), 0, 0, A());
    test(S(A()), 0, 1, A());
    test(S(A()), 1, 0, A());
    test(S(A()), 1, 1, A());
    test(S(A()), 1, 2, A());
    test(S("1", A()), 0, 0, A());
    test(S("1", A()), 0, 1, A());
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 0, A());
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 1, A());
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 10, A());
    test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()), 50, 100, A());
  }
#endif

  return true;
}

int main(int, char**)
{
  test();
#if TEST_STD_VER > 17
  static_assert(test());
#endif
  test_lwg2583();

  return 0;
}