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38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
/* This file is (c) 2008-2011 Konstantin Isakov <ikm@goldendict.org>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#ifndef __EX_HH_INCLUDED__
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#define __EX_HH_INCLUDED__
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#include <string>
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/// A way to declare an exception class fast
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/// Do like this:
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/// DEF_EX( exErrorInFoo, "An error in foo encountered", std::exception )
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/// DEF_EX( exFooNotFound, "Foo was not found", exErrorInFoo )
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#define DEF_EX( exName, exDescription, exParent ) \
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class exName: public exParent { \
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public: \
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virtual const char * what() const throw() { return (exDescription); } \
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virtual ~exName() throw() {} };
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/// Same as DEF_EX, but takes a runtime string argument, which gets concatenated
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/// with the description.
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///
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/// DEF_EX_STR( exCantOpen, "can't open file", std::exception )
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/// ...
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/// throw exCantOpen( "example.txt" );
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///
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/// what() would return "can't open file example.txt"
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#define DEF_EX_STR( exName, exDescription, exParent ) \
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class exName: public exParent { \
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std::string value; \
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public: \
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exName( std::string const & value_ ): value( std::string( exDescription ) + " " + value_ ) {} \
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virtual const char * what() const throw() { return value.c_str(); } \
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virtual ~exName() throw() {} };
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#endif
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