www.tartoos.com C++ Keywords

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C++ Keywords

Keywords are predefined reserved identifiers that have special meanings. They cannot be used as identifiers in your program. The following keywords are reserved for C++:

Syntax

keyword: one of

asm¹	auto	bad_cast	bad_typeid
bool	break	case	catch
char	class	const	const_cast
continue	default	delete	do
double	dynamic_cast	else	enum
except	explicit	extern	false
finally	float	for	friend
goto	if	inline	int
long	mutable	namespace	new
operator	private	protected	public
register	reinterpret_cast	return	short
signed	sizeof	static	static_cast
struct	switch	template	this
throw	true	try	type_info
typedef	typeid	typename	union
unsigned	using	virtual	void
volatile	while

1 Reserved for compatibility with other C++ implementations, but not implemented. Use__asm^.

Microsoft Specific

In Microsoft C++, identifiers with two leading underscores are reserved for compiler implementations. Therefore, the Microsoft convention is to precede Microsoft-specific keywords with double underscores. These words cannot be used as identifier names.

allocate³	__inline	property³
__asm¹	__int8	selectany³
__based²	__int16	__single_inheritance
__cdecl	__int32	__stdcall
__declspec	__int64	thread³
dllexport³	__leave	__try
dllimport³	__multiple_inheritance	uuid³
__except	naked³	__uuidof
__fastcall	nothrow³	__virtual_inheritance
__finally

¹ Replaces C++ asm syntax.

² The __based keyword has limited uses for 32-bit target compilations.

³These are special identifiers when used with __declspec; their use in other contexts is not restricted.

Microsoft extensions are enabled by default. To ensure that your programs are fully portable, you can disable Microsoft extensions by specifying the ANSI-compatible /Za command-line option (compile for ANSI compatibility) during compilation. When you do this, Microsoft-specific keywords are disabled.

When Microsoft extensions are enabled, you can use the previously-listed keywords in your programs. For ANSI compliance, these keywords are prefaced by a double underscore. For backward compatibility, single-underscore versions of all the keywords except __except, __finally, __leave, and __try are supported. In addition, __cdecl is available with no leading underscore.

END Microsoft Specific