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104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <memory>
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// unique_ptr
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// Test swap
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#include <memory>
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#include <cassert>
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#include "test_macros.h"
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#include "deleter_types.h"
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struct A
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{
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int state_;
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static int count;
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A() : state_(0) {++count;}
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explicit A(int i) : state_(i) {++count;}
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A(const A& a) : state_(a.state_) {++count;}
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A& operator=(const A& a) {state_ = a.state_; return *this;}
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~A() {--count;}
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friend bool operator==(const A& x, const A& y)
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{return x.state_ == y.state_;}
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};
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int A::count = 0;
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template <class T>
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struct NonSwappableDeleter {
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explicit NonSwappableDeleter(int) {}
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NonSwappableDeleter& operator=(NonSwappableDeleter const&) { return *this; }
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void operator()(T*) const {}
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private:
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NonSwappableDeleter(NonSwappableDeleter const&);
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};
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int main(int, char**)
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{
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{
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A* p1 = new A(1);
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std::unique_ptr<A, Deleter<A> > s1(p1, Deleter<A>(1));
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A* p2 = new A(2);
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std::unique_ptr<A, Deleter<A> > s2(p2, Deleter<A>(2));
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assert(s1.get() == p1);
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assert(*s1 == A(1));
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assert(s1.get_deleter().state() == 1);
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assert(s2.get() == p2);
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assert(*s2 == A(2));
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assert(s2.get_deleter().state() == 2);
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swap(s1, s2);
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assert(s1.get() == p2);
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assert(*s1 == A(2));
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assert(s1.get_deleter().state() == 2);
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assert(s2.get() == p1);
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assert(*s2 == A(1));
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assert(s2.get_deleter().state() == 1);
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assert(A::count == 2);
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}
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assert(A::count == 0);
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{
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A* p1 = new A[3];
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std::unique_ptr<A[], Deleter<A[]> > s1(p1, Deleter<A[]>(1));
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A* p2 = new A[3];
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std::unique_ptr<A[], Deleter<A[]> > s2(p2, Deleter<A[]>(2));
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assert(s1.get() == p1);
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assert(s1.get_deleter().state() == 1);
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assert(s2.get() == p2);
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assert(s2.get_deleter().state() == 2);
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swap(s1, s2);
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assert(s1.get() == p2);
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assert(s1.get_deleter().state() == 2);
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assert(s2.get() == p1);
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assert(s2.get_deleter().state() == 1);
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assert(A::count == 6);
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}
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assert(A::count == 0);
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#if TEST_STD_VER >= 11
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{
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// test that unique_ptr's specialized swap is disabled when the deleter
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// is non-swappable. Instead we should pick up the generic swap(T, T)
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// and perform 3 move constructions.
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typedef NonSwappableDeleter<int> D;
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D d(42);
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int x = 42;
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int y = 43;
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std::unique_ptr<int, D&> p(&x, d);
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std::unique_ptr<int, D&> p2(&y, d);
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std::swap(p, p2);
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}
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#endif
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return 0;
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}
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