writing parser

src/cxxopts.cpp

@@ -91,6 +91,7 @@ Options::parse(int& argc, char**& argv)
 
           if (iter == m_short.end())
           {
+            throw option_not_exists_exception(name);
             //argument not found
           }
 
@@ -111,6 +112,7 @@ Options::parse(int& argc, char**& argv)
             else
             {
               //error
+              throw option_requires_argument_exception(name);
             }
           }
         }
@@ -123,6 +125,7 @@ Options::parse(int& argc, char**& argv)
 
         if (iter == m_long.end())
         {
+          throw option_not_exists_exception(name);
         }
 
         auto opt = iter->second;

src/cxxopts.hpp

@@ -98,6 +98,24 @@ namespace cxxopts
     }
   };
 
+  class option_not_exists_exception : public OptionParseException
+  {
+    public:
+    option_not_exists_exception(const std::string& option)
+    : OptionParseException(u8"Option ‘" + option + u8"’ does not exist")
+    {
+    }
+  };
+
+  class option_requires_argument_exception : public OptionParseException
+  {
+    public:
+    option_requires_argument_exception(const std::string& option)
+    : OptionParseException(u8"Option ‘" + option + u8"’ requires an argument")
+    {
+    }
+  };
+
   class OptionAdder;
 
   class OptionDetails