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//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// <functional>
// class function<R(ArgTypes...)>
// function(const function& f);
// function(function&& f);
#include <functional>
#include <memory>
#include <cstdlib>
#include <cassert>
#include "test_macros.h"
#include "count_new.hpp"
class A
{
int data_[10];
public:
static int count;
A()
{
++count;
for (int i = 0; i < 10; ++i)
data_[i] = i;
}
A(const A&) {++count;}
~A() {--count;}
int operator()(int i) const
{
for (int j = 0; j < 10; ++j)
i += data_[j];
return i;
}
};
int A::count = 0;
int g(int) {return 0;}
int main()
{
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f = A();
assert(A::count == 1);
assert(globalMemCounter.checkOutstandingNewEq(1));
assert(f.target<A>());
assert(f.target<int(*)(int)>() == 0);
std::function<int(int)> f2 = f;
assert(A::count == 2);
assert(globalMemCounter.checkOutstandingNewEq(2));
assert(f2.target<A>());
assert(f2.target<int(*)(int)>() == 0);
}
assert(A::count == 0);
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f = g;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int(*)(int)>());
assert(f.target<A>() == 0);
std::function<int(int)> f2 = f;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f2.target<int(*)(int)>());
assert(f2.target<A>() == 0);
}
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int(*)(int)>() == 0);
assert(f.target<A>() == 0);
std::function<int(int)> f2 = f;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f2.target<int(*)(int)>() == 0);
assert(f2.target<A>() == 0);
}
{
std::function<int(int)> f;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int(*)(int)>() == 0);
assert(f.target<A>() == 0);
assert(!f);
std::function<long(int)> g = f;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(g.target<long(*)(int)>() == 0);
assert(g.target<A>() == 0);
assert(!g);
}
#if TEST_STD_VER >= 11
assert(globalMemCounter.checkOutstandingNewEq(0));
{ // Test rvalue references
std::function<int(int)> f = A();
assert(A::count == 1);
assert(globalMemCounter.checkOutstandingNewEq(1));
assert(f.target<A>());
assert(f.target<int(*)(int)>() == 0);
std::function<int(int)> f2 = std::move(f);
assert(A::count == 1);
assert(globalMemCounter.checkOutstandingNewEq(1));
assert(f2.target<A>());
assert(f2.target<int(*)(int)>() == 0);
assert(f.target<A>() == 0);
assert(f.target<int(*)(int)>() == 0);
}
assert(globalMemCounter.checkOutstandingNewEq(0));
{
// Test that moving a function constructed from a reference wrapper
// is done without allocating.
DisableAllocationGuard g;
using Ref = std::reference_wrapper<A>;
A a;
Ref aref(a);
std::function<int(int)> f(aref);
assert(A::count == 1);
assert(f.target<A>() == nullptr);
assert(f.target<Ref>());
std::function<int(int)> f2(std::move(f));
assert(A::count == 1);
assert(f2.target<A>() == nullptr);
assert(f2.target<Ref>());
LIBCPP_ASSERT(f.target<Ref>()); // f is unchanged because the target is small
}
{
// Test that moving a function constructed from a function pointer
// is done without allocating
DisableAllocationGuard guard;
using Ptr = int(*)(int);
Ptr p = g;
std::function<int(int)> f(p);
assert(f.target<A>() == nullptr);
assert(f.target<Ptr>());
std::function<int(int)> f2(std::move(f));
assert(f2.target<A>() == nullptr);
assert(f2.target<Ptr>());
LIBCPP_ASSERT(f.target<Ptr>()); // f is unchanged because the target is small
}
#endif // TEST_STD_VER >= 11
}
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