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- [/
- Copyright 2015 Peter Dimov.
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE_1_0.txt or copy at
- http://www.boost.org/LICENSE_1_0.txt).
- ]
- [section:declval declval]
- template <class T>
- typename add_rvalue_reference<T>::type declval() noexcept; // as unevaluated operand
- __std_ref C++11 20.2.4 [declval].
- __header ` #include <boost/type_traits/declval.hpp>` or ` #include <boost/type_traits.hpp>`
- The function template `declval` is used when a value of a certain type is required in
- a type computation context. For example, the type of the result of adding an `int` and
- a `float` can be obtained with the expression `decltype( declval<int>() + declval<float>() )`.
- [endsect]
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