Forward declares boost::hana::flatten.  
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| Namespaces | |
| boost::hana | |
| Namespace containing everything in the library. | |
| Variables | |
| constexpr auto | boost::hana::flatten | 
| Collapse two levels of monadic structure into a single level.Given a monadic value wrapped into two levels of monad, flattenremoves one such level. An implementation offlattenmust satisfy.  More... | |
Forward declares boost::hana::flatten.