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shared_ptr_Y.pass.cpp
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shared_ptr_Y.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <memory>
// shared_ptr
// template<class Y> shared_ptr(const shared_ptr<Y>& r);
#include <memory>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
struct B
{
static int count;
B() {++count;}
B(const B&) {++count;}
virtual ~B() {--count;}
};
int B::count = 0;
struct A
: public B
{
static int count;
A() {++count;}
A(const A& other) : B(other) {++count;}
~A() {--count;}
};
int A::count = 0;
struct C
{
static int count;
C() {++count;}
C(const C&) {++count;}
virtual ~C() {--count;}
};
int C::count = 0;
class private_delete_op
{
static void operator delete (void *p) {
return delete static_cast<char*>(p);
}
public:
static void operator delete[] (void *p) {
return delete[] static_cast<char*>(p);
}
};
class private_delete_arr_op
{
static void operator delete[] (void *p) {
return delete[] static_cast<char*>(p);
}
public:
static void operator delete (void *p) {
return delete static_cast<char*>(p);
}
};
// https://llvm.org/PR60258
// Invalid constructor SFINAE for std::shared_ptr's array ctors
static_assert(!std::is_constructible<std::shared_ptr<int>, const std::shared_ptr<long>&>::value, "");
static_assert( std::is_constructible<std::shared_ptr<B>, const std::shared_ptr<A>&>::value, "");
static_assert( std::is_constructible<std::shared_ptr<const A>, const std::shared_ptr<A>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<A>, const std::shared_ptr<const A>&>::value, "");
#if TEST_STD_VER >= 17
static_assert(!std::is_constructible<std::shared_ptr<int>, const std::shared_ptr<int[]>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int>, const std::shared_ptr<int[5]>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[]>, const std::shared_ptr<int>&>::value, "");
static_assert( std::is_constructible<std::shared_ptr<int[]>, const std::shared_ptr<int[5]>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, const std::shared_ptr<int>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[5]>, const std::shared_ptr<int[]>&>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<int[7]>, const std::shared_ptr<int[5]>&>::value, "");
#endif
int main(int, char**)
{
static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), "");
static_assert((!std::is_convertible<std::shared_ptr<B>, std::shared_ptr<A> >::value), "");
static_assert((!std::is_convertible<std::shared_ptr<A>, std::shared_ptr<C> >::value), "");
{
const std::shared_ptr<A> pA(new A);
assert(pA.use_count() == 1);
assert(B::count == 1);
assert(A::count == 1);
{
std::shared_ptr<B> pB(pA);
assert(B::count == 1);
assert(A::count == 1);
assert(pB.use_count() == 2);
assert(pA.use_count() == 2);
assert(pA.get() == pB.get());
}
assert(pA.use_count() == 1);
assert(B::count == 1);
assert(A::count == 1);
}
assert(B::count == 0);
assert(A::count == 0);
{
std::shared_ptr<A> pA;
assert(pA.use_count() == 0);
assert(B::count == 0);
assert(A::count == 0);
{
std::shared_ptr<B> pB(pA);
assert(B::count == 0);
assert(A::count == 0);
assert(pB.use_count() == 0);
assert(pA.use_count() == 0);
assert(pA.get() == pB.get());
}
assert(pA.use_count() == 0);
assert(B::count == 0);
assert(A::count == 0);
}
assert(B::count == 0);
assert(A::count == 0);
// This should work in C++03 but we get errors when trying to do SFINAE with the delete operator.
// GCC also complains about this.
#if TEST_STD_VER >= 11 && !defined(TEST_COMPILER_GCC)
{
// LWG2874: Make sure that when T (for std::shared_ptr<T>) is an array type,
// this constructor only participates in overload resolution when
// `delete[] p` is well formed. And when T is not an array type,
// this constructor only participates in overload resolution when
// `delete p` is well formed.
static_assert(!std::is_constructible<std::shared_ptr<private_delete_op>,
private_delete_op*>::value, "");
static_assert(!std::is_constructible<std::shared_ptr<private_delete_arr_op[4]>,
private_delete_arr_op*>::value, "");
}
#endif
#if TEST_STD_VER > 14
{
std::shared_ptr<A[]> p1(new A[8]);
assert(p1.use_count() == 1);
assert(A::count == 8);
{
std::shared_ptr<const A[]> p2(p1);
assert(A::count == 8);
assert(p2.use_count() == 2);
assert(p1.use_count() == 2);
assert(p1.get() == p2.get());
}
assert(p1.use_count() == 1);
assert(A::count == 8);
}
assert(A::count == 0);
#endif
{
std::shared_ptr<A const> pA(new A);
std::shared_ptr<B const> pB(pA);
assert(pB.get() == pA.get());
}
return 0;
}