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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: libcpp-has-no-threads
// ... test crashes clang
// <atomic>
// template <class Integral>
// Integral
// atomic_fetch_sub_explicit(volatile atomic<Integral>* obj, Integral op,
// memory_order m);
// template <class Integral>
// Integral
// atomic_fetch_sub_explicit(atomic<Integral>* obj, Integral op,
// memory_order m);
//
// template <class T>
// T*
// atomic_fetch_sub_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
// memory_order m);
// template <class T>
// T*
// atomic_fetch_sub_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m);
#include <atomic>
#include <type_traits>
#include <cassert>
#include "atomic_helpers.h"
template <class T>
struct TestFn {
void operator()() const {
{
typedef std::atomic<T> A;
A t;
std::atomic_init(&t, T(3));
assert(std::atomic_fetch_sub_explicit(&t, T(2),
std::memory_order_seq_cst) == T(3));
assert(t == T(1));
}
{
typedef std::atomic<T> A;
volatile A t;
std::atomic_init(&t, T(3));
assert(std::atomic_fetch_sub_explicit(&t, T(2),
std::memory_order_seq_cst) == T(3));
assert(t == T(1));
}
}
};
template <class T>
void testp()
{
{
typedef std::atomic<T> A;
typedef typename std::remove_pointer<T>::type X;
A t;
std::atomic_init(&t, T(3*sizeof(X)));
assert(std::atomic_fetch_sub_explicit(&t, 2,
std::memory_order_seq_cst) == T(3*sizeof(X)));
assert(t == T(1*sizeof(X)));
}
{
typedef std::atomic<T> A;
typedef typename std::remove_pointer<T>::type X;
volatile A t;
std::atomic_init(&t, T(3*sizeof(X)));
assert(std::atomic_fetch_sub_explicit(&t, 2,
std::memory_order_seq_cst) == T(3*sizeof(X)));
assert(t == T(1*sizeof(X)));
}
}
int main()
{
TestEachIntegralType<TestFn>()();
testp<int*>();
testp<const int*>();
}
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