Compiler.h

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/*
 * Copyright (c) Onix Solutions Limited. All rights reserved.
 *
 * This software owned by Onix Solutions Limited and is protected by copyright law
 * and international copyright treaties.
 *
 * Access to and use of the software is governed by the terms of the applicable ONIXS Software
 * Services Agreement (the Agreement) and Customer end user license agreements granting
 * a non-assignable, non-transferable and non-exclusive license to use the software
 * for it's own data processing purposes under the terms defined in the Agreement.
 *
 * Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
 * of this source code or associated reference material to any other location for further reproduction
 * or redistribution, and any amendments to this copyright notice, are expressly prohibited.
 *
 * Any reproduction or redistribution for sale or hiring of the Software not in accordance with
 * the terms of the Agreement is a violation of copyright law.
 */
 
#pragma once
 
#include <new>
 
// ONIXS_ICEMDH_LAUNDER(ptr)
//
// Returns a pointer to the object located at the address of `ptr`.
//
// Expands to `std::launder` from C++17 on, to `__builtin_launder` where the
// compiler provides it, and to `ptr` otherwise.
 
#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606L
#  define ONIXS_ICEMDH_LAUNDER(ptr) std::launder(ptr)
#elif defined(__has_builtin)
#  if __has_builtin(__builtin_launder)
#    define ONIXS_ICEMDH_LAUNDER(ptr) __builtin_launder(ptr)
#  endif
#elif defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 7
// GCC provides the builtin since 7, and `__has_builtin` since 10.
#  define ONIXS_ICEMDH_LAUNDER(ptr) __builtin_launder(ptr)
#endif
 
#ifndef ONIXS_ICEMDH_LAUNDER
#  define ONIXS_ICEMDH_LAUNDER(ptr) (ptr)
#endif