Forward declares boost::hana::when and boost::hana::when_valid.  
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| Namespaces | |
| boost::hana | |
| Namespace containing everything in the library. | |
| Typedefs | |
| template<typename ... > | |
| using | boost::hana::when_valid = when< true > | 
| Variant of whenallowing specializations to be enabled only if an expression is well-formed.  More... | |
Forward declares boost::hana::when and boost::hana::when_valid.