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Function template optional_manip

boost::log::optional_manip

Synopsis

// In header: <boost/log/utility/manipulators/optional.hpp>


template<typename OptionalT> 
  boost::enable_if_c< !is_scalar< OptionalT >::value &&!is_array< OptionalT >::value, optional_manipulator< OptionalT, void >>::type 
  optional_manip(OptionalT const & opt);

Description

Optional manipulator generator function.

[Note] Note

opt object must outlive the created manipulator object.

Parameters:

opt

Optional value to output. The optional value must support contextual conversion to bool and dereferencing, and its dereferencing result must support stream output.

Returns:

Manipulator to be inserted into the stream.
Copyright © 2007-2022 Andrey Semashev

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).

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