Forward declares boost::hana::at_key.  
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| Namespaces | |
| boost::hana | |
| Namespace containing everything in the library. | |
| Variables | |
| constexpr auto | boost::hana::at_key | 
| Returns the value associated to the given key in a structure, or fail.Given a keyand aSearchablestructure,at_keyreturns the first value whose key is equal to the givenkey, and fails at compile-time if no such key exists. This requires thekeyto be compile-timeComparable, exactly like forfind.at_keysatisfies the following:  More... | |
Forward declares boost::hana::at_key.