| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <tuple> |
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| 10 | |
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| 11 | // template <class... UTypes> |
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| 12 | // constexpr const tuple& operator=(const tuple<UTypes...>& u) const; |
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| 13 | // |
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| 14 | // Constraints: |
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| 15 | // - sizeof...(Types) equals sizeof...(UTypes) and |
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| 16 | // - (is_assignable_v<const Types&, const UTypes&> && ...) is true. |
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| 17 | |
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| 18 | // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
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| 19 | |
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| 20 | #include <cassert> |
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| 21 | #include <tuple> |
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| 22 | #include <type_traits> |
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| 23 | |
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| 24 | #include "test_macros.h" |
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| 25 | #include "copy_move_types.h" |
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| 26 | |
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| 27 | // test constraints |
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| 28 | |
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| 29 | // sizeof...(Types) equals sizeof...(UTypes) |
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| 30 | static_assert(std::is_assignable_v<const std::tuple<int&>&, const std::tuple<long&>&>); |
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| 31 | static_assert(!std::is_assignable_v<const std::tuple<int&, int&>&, const std::tuple<long&>&>); |
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| 32 | static_assert(!std::is_assignable_v<const std::tuple<int&>&, const std::tuple<long&, long&>&>); |
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| 33 | |
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| 34 | // (is_assignable_v<const Types&, const UTypes&> && ...) is true |
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| 35 | static_assert(std::is_assignable_v<const std::tuple<AssignableFrom<ConstCopyAssign>>&, |
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| 36 | const std::tuple<ConstCopyAssign>&>); |
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| 37 | |
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| 38 | static_assert(std::is_assignable_v<const std::tuple<AssignableFrom<ConstCopyAssign>, ConstCopyAssign>&, |
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| 39 | const std::tuple<ConstCopyAssign, ConstCopyAssign>&>); |
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| 40 | |
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| 41 | static_assert(!std::is_assignable_v<const std::tuple<AssignableFrom<ConstCopyAssign>, CopyAssign>&, |
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| 42 | const std::tuple<ConstCopyAssign, CopyAssign>&>); |
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| 43 | |
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| 44 | constexpr bool test() { |
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| 45 | // reference types |
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| 46 | { |
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| 47 | int i1 = 1; |
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| 48 | int i2 = 2; |
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| 49 | long j1 = 3; |
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| 50 | long j2 = 4; |
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| 51 | const std::tuple<int&, int&> t1{i1, i2}; |
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| 52 | const std::tuple<long&, long&> t2{j1, j2}; |
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| 53 | t2 = t1; |
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| 54 | assert(std::get<0>(t2) == 1); |
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| 55 | assert(std::get<1>(t2) == 2); |
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| 56 | } |
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| 57 | |
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| 58 | // user defined const copy assignment |
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| 59 | { |
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| 60 | const std::tuple<ConstCopyAssign> t1{1}; |
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| 61 | const std::tuple<AssignableFrom<ConstCopyAssign>> t2{2}; |
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| 62 | t2 = t1; |
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| 63 | assert(std::get<0>(t2).v.val == 1); |
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| 64 | } |
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| 65 | |
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| 66 | // make sure the right assignment operator of the type in the tuple is used |
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| 67 | { |
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| 68 | std::tuple<TracedAssignment> t1{}; |
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| 69 | const std::tuple<AssignableFrom<TracedAssignment>> t2{}; |
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| 70 | t2 = t1; |
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| 71 | assert(std::get<0>(t2).v.constCopyAssign == 1); |
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| 72 | } |
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| 73 | |
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| 74 | return true; |
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| 75 | } |
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| 76 | |
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| 77 | int main(int, char**) { |
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| 78 | test(); |
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| 79 | |
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| 80 | // gcc cannot have mutable member in constant expression |
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| 81 | #if !defined(TEST_COMPILER_GCC) |
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| 82 | static_assert(test()); |
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| 83 | #endif |
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| 84 | return 0; |
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| 85 | } |
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| 86 | |
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