forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// UNSUPPORTED: c++98, c++03
|
|
|
|
// <utility>
|
|
|
|
// template <class T1, class T2> struct pair
|
|
|
|
// pair& operator=(pair const& p);
|
|
|
|
#include <utility>
|
|
#include <memory>
|
|
#include <cassert>
|
|
|
|
|
|
struct NonAssignable {
|
|
NonAssignable& operator=(NonAssignable const&) = delete;
|
|
NonAssignable& operator=(NonAssignable&&) = delete;
|
|
};
|
|
struct CopyAssignable {
|
|
CopyAssignable() = default;
|
|
CopyAssignable(CopyAssignable const&) = default;
|
|
CopyAssignable& operator=(CopyAssignable const&) = default;
|
|
CopyAssignable& operator=(CopyAssignable&&) = delete;
|
|
};
|
|
struct MoveAssignable {
|
|
MoveAssignable() = default;
|
|
MoveAssignable& operator=(MoveAssignable const&) = delete;
|
|
MoveAssignable& operator=(MoveAssignable&&) = default;
|
|
};
|
|
|
|
struct CountAssign {
|
|
static int copied;
|
|
static int moved;
|
|
static void reset() { copied = moved = 0; }
|
|
CountAssign() = default;
|
|
CountAssign& operator=(CountAssign const&) { ++copied; return *this; }
|
|
CountAssign& operator=(CountAssign&&) { ++moved; return *this; }
|
|
};
|
|
int CountAssign::copied = 0;
|
|
int CountAssign::moved = 0;
|
|
|
|
struct Incomplete;
|
|
extern Incomplete inc_obj;
|
|
|
|
int main()
|
|
{
|
|
{
|
|
typedef std::pair<CopyAssignable, short> P;
|
|
const P p1(CopyAssignable(), 4);
|
|
P p2;
|
|
p2 = p1;
|
|
assert(p2.second == 4);
|
|
}
|
|
{
|
|
using P = std::pair<int&, int&&>;
|
|
int x = 42;
|
|
int y = 101;
|
|
int x2 = -1;
|
|
int y2 = 300;
|
|
P p1(x, std::move(y));
|
|
P p2(x2, std::move(y2));
|
|
p1 = p2;
|
|
assert(p1.first == x2);
|
|
assert(p1.second == y2);
|
|
}
|
|
{
|
|
using P = std::pair<int, NonAssignable>;
|
|
static_assert(!std::is_copy_assignable<P>::value, "");
|
|
}
|
|
{
|
|
CountAssign::reset();
|
|
using P = std::pair<CountAssign, CopyAssignable>;
|
|
static_assert(std::is_copy_assignable<P>::value, "");
|
|
P p;
|
|
P p2;
|
|
p = p2;
|
|
assert(CountAssign::copied == 1);
|
|
assert(CountAssign::moved == 0);
|
|
}
|
|
{
|
|
using P = std::pair<int, MoveAssignable>;
|
|
static_assert(!std::is_copy_assignable<P>::value, "");
|
|
}
|
|
{
|
|
using P = std::pair<int, Incomplete&>;
|
|
static_assert(!std::is_copy_assignable<P>::value, "");
|
|
P p(42, inc_obj);
|
|
assert(&p.second == &inc_obj);
|
|
}
|
|
}
|
|
|
|
struct Incomplete {};
|
|
Incomplete inc_obj;
|