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文件: /usr/include/boost/type_erasure/same_type.hpp
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// Boost.TypeErasure library // // Copyright 2011 Steven Watanabe // // Distributed under the Boost Software License Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // $Id$ #ifndef BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED #define BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED namespace boost { namespace type_erasure { /** * A built in concept that indicates that two * types are the same. Either T or U or both * can be placeholders. * * \warning Any number of instances of @ref deduced * can be connected with @ref same_type, but there * should be at most one regular placeholder in * the group. same_type<_a, _b> is not allowed. * The reason for this is that the library needs * to normalize all the placeholders, and in this * context there is no way to decide whether to * use @ref _a or @ref _b. */ template<class T, class U> struct same_type {}; } } #endif
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