git.sesse.net Git - casparcg/blob - common/param.h

   1 #pragma once
   2
   3 #include "except.h"
   4
   5 #include <boost/lexical_cast.hpp>
   6
   7 #include <type_traits>
   8 #include <string>
   9
  10 namespace caspar {
  11
  12 template<typename T, typename C>
  13 typename std::enable_if<!std::is_convertible<T, std::wstring>::value, typename std::decay<T>::type>::type get_param(const std::wstring& name, C&& params, T fail_value = T())
  14 {
  15         auto it = std::find(std::begin(params), std::end(params), name);
  16         if(it == params.end())
  17                 return fail_value;
  18
  19         try
  20         {
  21                 if(++it == params.end())
  22                         throw std::out_of_range("");
  23
  24                 return boost::lexical_cast<std::decay<T>::type>(*it);
  25         }
  26         catch(...)
  27         {
  28                 CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("Failed to parse param.") << arg_name_info(name) << nested_exception(std::current_exception()));
  29         }
  30 }
  31
  32 template<typename C>
  33 std::wstring get_param(const std::wstring& name, C&& params, const std::wstring& fail_value = L"")
  34 {
  35         auto it = std::find(std::begin(params), std::end(params), name);
  36         if(it == params.end())
  37                 return fail_value;
  38
  39         try
  40         {
  41                 if(++it == params.end())
  42                         throw std::out_of_range("");
  43
  44                 return *it;
  45         }
  46         catch(...)
  47         {
  48                 CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("Failed to parse param.") << arg_name_info(name) << nested_exception(std::current_exception()));
  49         }
  50 }
  51
  52 }