restinio/0.6-api/optional_8hpp_source.html

 /*
     restinio
 */

 /*!
     Adoption for std::optional (c++17).

     @since v.0.4.4
 */

 #pragma once

 #if defined(RESTINIO_EXTERNAL_OPTIONAL_LITE)
     #include <nonstd/optional.hpp>
 #else
     #include "third_party/optional-lite/optional.hpp"
 #endif

 namespace restinio
 {
     template< class T >
     using optional_t = nonstd::optional< T >;

     using nonstd::nullopt;
     using nonstd::nullopt_t;

 } /* namespace restinio */
nonstd::optional_lite::optional::initialize
void initialize(V const &value)
Definition: optional.hpp:1486

nonstd
Definition: expected.hpp:132

restinio::opt_value
std::enable_if< std::is_same< Parameter_Container, query_string_params_t >::value||std::is_same< Parameter_Container, router::route_params_t >::value, optional_t< Value_Type > >::type opt_value(const Parameter_Container &params, string_view_t key)
Gets the value of a parameter specified by key wrapped in optional_t<Value_Type> if parameter exists ...
Definition: value_or.hpp:64