102 lines
2.6 KiB
C++
102 lines
2.6 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
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// <utility>
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// template <class T1, class T2> struct pair
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// pair& operator=(pair const& p);
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#include <utility>
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#include <memory>
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#include <cassert>
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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() = default;
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CopyAssignable(CopyAssignable const&) = default;
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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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struct MoveAssignable {
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MoveAssignable() = default;
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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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struct Incomplete;
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extern Incomplete inc_obj;
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int main()
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{
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{
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typedef std::pair<CopyAssignable, short> P;
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const P p1(CopyAssignable(), 4);
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P p2;
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p2 = p1;
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assert(p2.second == 4);
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}
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{
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using P = std::pair<int&, int&&>;
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int x = 42;
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int y = 101;
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int x2 = -1;
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int y2 = 300;
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P p1(x, std::move(y));
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P p2(x2, std::move(y2));
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p1 = p2;
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assert(p1.first == x2);
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assert(p1.second == y2);
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}
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{
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using P = std::pair<int, NonAssignable>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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}
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{
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CountAssign::reset();
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using P = std::pair<CountAssign, CopyAssignable>;
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static_assert(std::is_copy_assignable<P>::value, "");
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P p;
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P p2;
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p = p2;
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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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using P = std::pair<int, MoveAssignable>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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}
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{
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using P = std::pair<int, Incomplete&>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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P p(42, inc_obj);
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assert(&p.second == &inc_obj);
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}
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}
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struct Incomplete {};
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Incomplete inc_obj;
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