Forward declares boost::hana::none.  
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| Namespaces | |
| boost::hana | |
| Namespace containing everything in the library. | |
| Variables | |
| constexpr auto | boost::hana::none | 
| Returns whether all of the keys of the structure are false-valued.The keys of the structure must be Logicals. If the structure is not finite, a true-valued key must appear at a finite "index" in order for this method to finish.  More... | |
Forward declares boost::hana::none.