forked from OSchip/llvm-project
109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <any>
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// any& operator=(any &&);
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// Test move assignment.
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#include <any>
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#include <cassert>
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#include "any_helpers.h"
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#include "test_macros.h"
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using std::any;
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using std::any_cast;
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template <class LHS, class RHS>
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void test_move_assign() {
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assert(LHS::count == 0);
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assert(RHS::count == 0);
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{
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LHS const s1(1);
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any a(s1);
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RHS const s2(2);
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any a2(s2);
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assert(LHS::count == 2);
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assert(RHS::count == 2);
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a = std::move(a2);
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assert(LHS::count == 1);
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assert(RHS::count == 2 + a2.has_value());
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LIBCPP_ASSERT(RHS::count == 2); // libc++ leaves the object empty
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assertContains<RHS>(a, 2);
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if (a2.has_value())
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assertContains<RHS>(a2, 0);
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LIBCPP_ASSERT(!a2.has_value());
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}
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assert(LHS::count == 0);
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assert(RHS::count == 0);
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}
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template <class LHS>
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void test_move_assign_empty() {
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assert(LHS::count == 0);
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{
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any a;
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any a2((LHS(1)));
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assert(LHS::count == 1);
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a = std::move(a2);
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assert(LHS::count == 1 + a2.has_value());
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LIBCPP_ASSERT(LHS::count == 1);
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assertContains<LHS>(a, 1);
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if (a2.has_value())
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assertContains<LHS>(a2, 0);
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LIBCPP_ASSERT(!a2.has_value());
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}
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assert(LHS::count == 0);
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{
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any a((LHS(1)));
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any a2;
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assert(LHS::count == 1);
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a = std::move(a2);
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assert(LHS::count == 0);
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assertEmpty<LHS>(a);
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assertEmpty(a2);
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}
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assert(LHS::count == 0);
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}
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void test_move_assign_noexcept() {
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any a1;
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any a2;
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static_assert(
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noexcept(a1 = std::move(a2))
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, "any & operator=(any &&) must be noexcept"
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);
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}
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int main() {
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test_move_assign_noexcept();
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test_move_assign<small1, small2>();
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test_move_assign<large1, large2>();
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test_move_assign<small, large>();
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test_move_assign<large, small>();
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test_move_assign_empty<small>();
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test_move_assign_empty<large>();
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}
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