Adding basic exception hierarchy

cpp/sopt/exception.h

@@ -0,0 +1,46 @@
+#ifndef SOPT_EXCEPTION
+#define SOPT_EXCEPTION
+
+#include <exception>
+#include <sstream>
+#include <string>
+
+namespace sopt {
+  //! Root exception for sopt
+  class Exception : public std::exception {
+
+    protected:
+     //! Constructor for derived classes
+     Exception(std::string const & name, std::string const &filename, size_t lineno)
+       : std::exception(), message(header(name, filename, lineno)) {}
+
+    public:
+     //! Creates exception
+     Exception(std::string const &filename, size_t lineno)
+       : Exception("sopt::Exception", filename, lineno) {}
+
+     //! Creates message
+     const char* what() const noexcept override { return message.c_str(); }
+
+     //! Header of the message
+     static std::string header(
+         std::string const &name, std::string const &filename, size_t lineno) {
+       return (std::ostringstream() << name << " at " << filename << ":" << lineno).str();
+     }
+
+     //! Adds to message
+     template<class OBJECT> 
+       Exception& operator<<(OBJECT const &object) {
+         message = (std::ostringstream(message) << object).str();
+         return *this;
+       }
+
+    private:
+     //! Message to issue
+     std::string message;
+  };
+
+# define SOPT_THROW(MSG) throw sopt::Exception(__FILE__, __LINE__) << "\n" << MSG
+
+} /* sopt */ 
+#endif