126 lines
3.4 KiB
C++
126 lines
3.4 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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// <tuple>
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// template <class... Types> class tuple;
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// tuple& operator=(tuple&& u);
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <utility>
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#include <cassert>
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#include "MoveOnly.h"
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struct NonAssignable {
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NonAssignable& operator=(NonAssignable const&) = delete;
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NonAssignable& operator=(NonAssignable&&) = delete;
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};
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struct CopyAssignable {
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CopyAssignable& operator=(CopyAssignable const&) = default;
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CopyAssignable& operator=(CopyAssignable&&) = delete;
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};
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static_assert(std::is_copy_assignable<CopyAssignable>::value, "");
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struct MoveAssignable {
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MoveAssignable& operator=(MoveAssignable const&) = delete;
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MoveAssignable& operator=(MoveAssignable&&) = default;
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};
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struct CountAssign {
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static int copied;
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static int moved;
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static void reset() { copied = moved = 0; }
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CountAssign() = default;
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CountAssign& operator=(CountAssign const&) { ++copied; return *this; }
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CountAssign& operator=(CountAssign&&) { ++moved; return *this; }
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};
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int CountAssign::copied = 0;
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int CountAssign::moved = 0;
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int main()
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{
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{
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typedef std::tuple<> T;
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T t0;
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T t;
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t = std::move(t0);
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}
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{
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typedef std::tuple<MoveOnly> T;
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T t0(MoveOnly(0));
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T t;
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t = std::move(t0);
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assert(std::get<0>(t) == 0);
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}
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{
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typedef std::tuple<MoveOnly, MoveOnly> T;
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T t0(MoveOnly(0), MoveOnly(1));
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T t;
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t = std::move(t0);
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assert(std::get<0>(t) == 0);
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assert(std::get<1>(t) == 1);
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}
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{
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typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
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T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
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T t;
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t = std::move(t0);
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assert(std::get<0>(t) == 0);
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assert(std::get<1>(t) == 1);
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assert(std::get<2>(t) == 2);
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}
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{
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// test reference assignment.
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using T = std::tuple<int&, int&&>;
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int x = 42;
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int y = 100;
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int x2 = -1;
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int y2 = 500;
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T t(x, std::move(y));
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T t2(x2, std::move(y2));
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t = std::move(t2);
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assert(std::get<0>(t) == x2);
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assert(&std::get<0>(t) == &x);
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assert(std::get<1>(t) == y2);
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assert(&std::get<1>(t) == &y);
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}
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{
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// test that the implicitly generated move assignment operator
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// is properly deleted
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using T = std::tuple<std::unique_ptr<int>>;
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static_assert(std::is_move_assignable<T>::value, "");
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static_assert(!std::is_copy_assignable<T>::value, "");
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}
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{
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using T = std::tuple<int, NonAssignable>;
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static_assert(!std::is_move_assignable<T>::value, "");
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}
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{
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using T = std::tuple<int, MoveAssignable>;
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static_assert(std::is_move_assignable<T>::value, "");
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}
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{
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// The move should decay to a copy.
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CountAssign::reset();
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using T = std::tuple<CountAssign, CopyAssignable>;
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static_assert(std::is_move_assignable<T>::value, "");
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T t1;
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T t2;
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t1 = std::move(t2);
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assert(CountAssign::copied == 1);
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assert(CountAssign::moved == 0);
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}
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}
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