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

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