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Diffstat (limited to 'src/components/utils/include/utils/type_traits.h')
-rw-r--r-- | src/components/utils/include/utils/type_traits.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/components/utils/include/utils/type_traits.h b/src/components/utils/include/utils/type_traits.h new file mode 100644 index 0000000000..e235156afe --- /dev/null +++ b/src/components/utils/include/utils/type_traits.h @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2016, Ford Motor Company + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following + * disclaimer in the documentation and/or other materials provided with the + * distribution. + * + * Neither the name of the Ford Motor Company nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#ifndef SRC_COMPONENTS_UTILS_INCLUDE_UTILS_TYPE_TRAITS_H_ +#define SRC_COMPONENTS_UTILS_INCLUDE_UTILS_TYPE_TRAITS_H_ + +namespace utils { +namespace type_traits { + +typedef char(&yes)[1]; +typedef char(&no)[2]; + +template <typename Base, typename Derived> +struct Host { + operator Base*() const; + operator Derived*(); +}; + +template <typename Base, typename Derived> +struct is_base_of { + template <typename T> + static yes check(Derived*, T); + static no check(Base*, int); + + static const bool value = + sizeof(check(Host<Base, Derived>(), int())) == sizeof(yes); +}; + +template <bool B, class T = void> +struct enable_if {}; + +template <class T> +struct enable_if<true, T> { + typedef T type; +}; + +} // namespace type_traits +} // namespace utils + +#endif // SRC_COMPONENTS_UTILS_INCLUDE_UTILS_TYPE_TRAITS_H_ |