RESTinio
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value_or.hpp
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1/*
2 restinio
3*/
4
11#pragma once
12
13#include <type_traits>
14
15#include <restinio/cast_to.hpp>
18
19namespace restinio
20{
21
23
31template < typename Value_Type, typename Parameter_Container >
32typename std::enable_if<
33 std::is_same< Parameter_Container, query_string_params_t >::value ||
34 std::is_same< Parameter_Container, router::route_params_t >::value,
35 Value_Type >::type
37{
38 const auto value = params.get_param( key );
39 if( value )
40 {
41 return cast_to< Value_Type >( *value );
42 }
43
44 return default_value;
45}
46
59template < typename Value_Type, typename Parameter_Container >
60typename std::enable_if<
61 std::is_same< Parameter_Container, query_string_params_t >::value ||
62 std::is_same< Parameter_Container, router::route_params_t >::value,
63 std::optional< Value_Type > >::type
65{
66 std::optional< Value_Type > result{};
67
68 const auto value = params.get_param( key );
69 if( value )
70 {
71 result = cast_to< Value_Type >( *value );
72 }
73
74 return result;
75}
76
77} /* namespace restinio */
std::enable_if< std::is_same< Parameter_Container, query_string_params_t >::value||std::is_same< Parameter_Container, router::route_params_t >::value, std::optional< Value_Type > >::type opt_value(const Parameter_Container &params, string_view_t key)
Gets the value of a parameter specified by key wrapped in std::optional<Value_Type> if parameter exis...
Definition value_or.hpp:64
run_on_this_thread_settings_t< Traits > on_this_thread()
A special marker for the case when http_server must be run on the context of the current thread.
std::string_view string_view_t
std::enable_if< std::is_same< Parameter_Container, query_string_params_t >::value||std::is_same< Parameter_Container, router::route_params_t >::value, Value_Type >::type value_or(const Parameter_Container &params, string_view_t key, Value_Type default_value)
Get parameter value or a given default.
Definition value_or.hpp:36