value_or.hpp

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/*
    restinio
*/

 
#pragma once
 
#include <type_traits>
 
#include <restinio/cast_to.hpp>
#include <restinio/uri_helpers.hpp>
#include <restinio/router/express.hpp>
 
namespace restinio
{


template < typename Value_Type, typename Parameter_Container >
typename 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 )
{
    const auto value = params.get_param( key );
    if( value )
    {
        return cast_to< Value_Type >( *value );
    }
 
    return default_value;
}

template < typename Value_Type, typename Parameter_Container >
typename 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 )
{
    std::optional< Value_Type > result{};
 
    const auto value = params.get_param( key );
    if( value )
    {
        result = cast_to< Value_Type >( *value );
    }
 
    return result;
}
 
} /* namespace restinio */