/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org> * Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */ #ifndef __EX_HH_INCLUDED__ #define __EX_HH_INCLUDED__ #include <string> /// A way to declare an exception class fast /// Do like this: /// DEF_EX( exErrorInFoo, "An error in foo encountered", std::exception ) /// DEF_EX( exFooNotFound, "Foo was not found", exErrorInFoo ) #define DEF_EX( exName, exDescription, exParent ) \ class exName: public exParent { \ public: \ virtual const char * what() const noexcept { return (exDescription); } \ virtual ~exName() noexcept {} }; /// Same as DEF_EX, but takes a runtime string argument, which gets concatenated /// with the description. /// /// DEF_EX_STR( exCantOpen, "can't open file", std::exception ) /// ... /// throw exCantOpen( "example.txt" ); /// /// what() would return "can't open file example.txt" #define DEF_EX_STR( exName, exDescription, exParent ) \ class exName: public exParent { \ std::string value; \ public: \ exName( std::string const & value_ ): value( std::string( exDescription ) + " " + value_ ) {} \ virtual const char * what() const noexcept { return value.c_str(); } \ virtual ~exName() noexcept {} }; #endif