esp-idf/components/esp_common/include/esp_assert.h

// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __ESP_ASSERT_H__
#define __ESP_ASSERT_H__

#include "assert.h"

/* Assert at compile time if possible, runtime otherwise */
#ifndef __cplusplus
/* __builtin_choose_expr() is only in C, makes this a lot cleaner */
#define TRY_STATIC_ASSERT(CONDITION, MSG) do {                                                              \
            _Static_assert(__builtin_choose_expr(__builtin_constant_p(CONDITION), (CONDITION), 1), #MSG);   \
            assert(#MSG && (CONDITION));                                                                    \
        } while(0)
#else
/* for C++, use __attribute__((error)) - works almost as well as _Static_assert */
#define TRY_STATIC_ASSERT(CONDITION, MSG) do {                                                              \
            if (__builtin_constant_p(CONDITION) && !(CONDITION)) {          \
                extern __attribute__((error(#MSG))) void failed_compile_time_assert(void);      \
                failed_compile_time_assert();                                                   \
            }                                                                                   \
            assert(#MSG && (CONDITION));                                                                    \
        } while(0)
#endif /* __cplusplus */

#endif /* __ESP_ASSERT_H__ */