baf6f91851
- add the `from_range_t` constructors and the related deduction guides; - add the `insert_range`/`assign_range`/etc. member functions. (Note: this patch is split from https://reviews.llvm.org/D142335) Differential Revision: https://reviews.llvm.org/D149832
51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// To silence a GCC warning-turned-error re. `BadAlloc::value_type`.
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// ADDITIONAL_COMPILE_FLAGS: -Wno-unused-local-typedefs
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// template<ranges::input_range R,
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// class Allocator = allocator<ranges::range_value_t<R>>>
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// basic_string(from_range_t, R&&, Allocator = Allocator())
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// -> basic_string<ranges::range_value_t<R>, char_traits<ranges::range_value_t<R>>,
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// Allocator>; // C++23
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//
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// The deduction guide shall not participate in overload resolution if Allocator
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// is a type that does not qualify as an allocator (in addition to the `input_range` concept being satisfied by `R`).
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#include <array>
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#include <string>
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#include "deduction_guides_sfinae_checks.h"
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#include "test_allocator.h"
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int main(int, char**) {
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using Char = char16_t;
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{
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std::basic_string c(std::from_range, std::array<Char, 0>());
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static_assert(std::is_same_v<decltype(c), std::basic_string<Char>>);
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}
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{
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using Alloc = test_allocator<Char>;
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std::basic_string c(std::from_range, std::array<Char, 0>(), Alloc());
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static_assert(std::is_same_v<decltype(c), std::basic_string<Char, std::char_traits<Char>, Alloc>>);
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}
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// Note: defining `value_type` is a workaround because one of the deduction guides will end up instantiating
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// `basic_string`, and that would fail with a hard error if the given allocator doesn't define `value_type`.
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struct BadAlloc { using value_type = char; };
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SequenceContainerDeductionGuidesSfinaeAway<std::basic_string, std::basic_string<char>, BadAlloc>();
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return 0;
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}
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