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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// REQUIRES: c++11 || c++14
// <functional>
// class function<R(ArgTypes...)>
// template<class A> function(allocator_arg_t, const A&, function&&);
//
// This signature was removed in C++17
#include <functional>
#include <memory>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
#include "count_new.h"
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(int, char**)
{
globalMemCounter.reset();
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(std::allocator_arg, bare_allocator<A>(),
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::allocator_arg, std::allocator<int>{},
std::move(f));
assert(A::count == 1);
assert(f2.target<A>() == nullptr);
assert(f2.target<Ref>());
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::allocator_arg, std::allocator<int>(),
std::move(f));
assert(f2.target<A>() == nullptr);
assert(f2.target<Ptr>());
assert(f.target<Ptr>()); // f is unchanged because the target is small
}
return 0;
}
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