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param_view::has_value
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param_view::has_value

True if a value is present.

Synopsis 
bool has_value = false;
Description

The presence of a value is indicated by has_value == true. An empty value is distinct from no value.

Copyright © 2021, 2022 Vinnie Falco, Alan de Freitas

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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