RESTinio
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>
16 #include <restinio/uri_helpers.hpp>
18 
19 namespace restinio
20 {
21 
23 
31 template < typename Value_Type, typename Parameter_Container >
32 typename 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
36 value_or( const Parameter_Container & params, string_view_t key, Value_Type default_value )
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 
59 template < typename Value_Type, typename Parameter_Container >
60 typename 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  optional_t< Value_Type > >::type
64 opt_value( const Parameter_Container & params, string_view_t key )
65 {
66  optional_t< 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 */
express.hpp
uri_helpers.hpp
restinio::string_view_t
nonstd::string_view string_view_t
Definition: string_view.hpp:19
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
restinio::value_or
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
cast_to.hpp
nonstd::optional_lite::optional
class optional
Definition: optional.hpp:839
restinio
Definition: asio_include.hpp:21