blender/intern/cycles/util/util_static_assert.h

/*
 * Copyright 2011-2016 Blender Foundation
 *
 * 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 __UTIL_STATIC_ASSERT_H__
#  define __UTIL_STATIC_ASSERT_H__

CCL_NAMESPACE_BEGIN

/* TODO(sergey): In theory CUDA might work with own static assert
 * implementation since it's just pure C++.
 */
#  ifdef __KERNEL_GPU__
#    ifndef static_assert
#      define static_assert(statement, message)
#    endif
#  endif /* __KERNEL_GPU__ */

/* TODO(sergey): For until C++11 is a bare minimum for us,
 * we do a bit of a trickery to show meaningful message so
 * it's more or less clear what's wrong when building without
 * C++11.
 *
 * The thing here is: our non-C++11 implementation doesn't
 * have a way to print any message after preprocessor
 * substitution so we rely on the message which is passed to
 * static_assert() since that's the only message visible when
 * compilation fails.
 *
 * After C++11 bump it should be possible to glue structure
 * name to the error message,
 */
#  define static_assert_align(st, align) \
    static_assert((sizeof(st) % (align) == 0), "Structure must be strictly aligned")  // NOLINT

CCL_NAMESPACE_END

#endif /* __UTIL_STATIC_ASSERT_H__ */