Forward declares boost::hana::when and boost::hana::when_valid.  
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|  | boost::hana | 
|  | Namespace containing everything in the library. 
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| template<typename... > | 
| using | boost::hana::when_valid = when< true > | 
|  | Variant of whenallowing specializations to be enabled only if an expression is well-formed.  More...
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Forward declares boost::hana::when and boost::hana::when_valid. 
- Copyright
- Louis Dionne 2013-2017 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)