projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // Boost.TypeErasure library |
| 2 | // | |
| 3 | // Copyright 2011 Steven Watanabe | |
| 4 | // | |
| 5 | // Distributed under the Boost Software License Version 1.0. (See | |
| 6 | // accompanying file LICENSE_1_0.txt or copy at | |
| 7 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 8 | // | |
| 9 | // $Id$ | |
| 10 | ||
| 11 | #ifndef BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED | |
| 12 | #define BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED | |
| 13 | ||
| 14 | namespace boost { | |
| 15 | namespace type_erasure { | |
| 16 | ||
| 17 | /** | |
| 18 | * A built in concept that indicates that two | |
| 19 | * types are the same. Either T or U or both | |
| 20 | * can be placeholders. | |
| 21 | * | |
| 22 | * \warning Any number of instances of @ref deduced | |
| 23 | * can be connected with @ref same_type, but there | |
| 24 | * should be at most one regular placeholder in | |
| 25 | * the group. same_type<_a, _b> is not allowed. | |
| 26 | * The reason for this is that the library needs | |
| 27 | * to normalize all the placeholders, and in this | |
| 28 | * context there is no way to decide whether to | |
| 29 | * use @ref _a or @ref _b. | |
| 30 | */ | |
| 31 | template<class T, class U> | |
| 32 | struct same_type {}; | |
| 33 | ||
| 34 | } | |
| 35 | } | |
| 36 | ||
| 37 | #endif |