libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     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.
//
//===----------------------------------------------------------------------===//

// test sized operator [] delete calls the unsized operator [] delete.
// When sized operator delete [] is not available (ex C++11) then the unsized
// operator delete [] is called directly.

// UNSUPPORTED: sanitizer-new-delete

#include <new>
#include <cstddef>
#include <cstdlib>
#include <cassert>

int delete_called = 0;
int delete_nothrow_called = 0;

void operator delete[](void* p) throw()
{
    ++delete_called;
    std::free(p);
}

void operator delete[](void* p, const std::nothrow_t&) throw()
{
    ++delete_nothrow_called;
    std::free(p);
}

// NOTE: Use a class with a non-trivial destructor as the test type in order
// to ensure the correct overload is called.
// C++14 5.3.5 [expr.delete]p10
// - If the type is complete and if, for the second alternative (delete array)
//   only, the operand is a pointer to a class type with a non-trivial
//   destructor or a (possibly multi-dimensional) array thereof, the function
//   with two parameters is selected.
// - Otherwise, it is unspecified which of the two deallocation functions is
//   selected.
struct A { ~A() {} };

int main()
{
    A* x = new A[3];
    assert(0 == delete_called);
    assert(0 == delete_nothrow_called);

    delete [] x;
    assert(1 == delete_called);
    assert(0 == delete_nothrow_called);
}