Boost.Hana: boost/hana/fwd/at_key.hpp File Reference

| Boost.Hana 1.0.0 Your standard library for metaprogramming |

Namespaces | Variables
at_key.hpp File Reference

Forward declares `boost::hana::at_key`. More...

## Namespaces

| boost
| 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 `key` and a `Searchable` structure, `at_key` returns the first value whose key is equal to the given `key`, and fails at compile-time if no such key exists. This requires the `key` to be compile-time `Comparable`, exactly like for `find`. `at_key` satisfies the following: More...

## Detailed Description

Forward declares `boost::hana::at_key`.

Copyright
  Louis Dionne 2013-2016 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)