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Macros
#define	OPEN3D_FIX_MSVC_(...) __VA_ARGS__

#define	OPEN3D_CONCAT_IMPL_(s1, s2) s1##s2

#define	OPEN3D_CONCAT(s1, s2) OPEN3D_CONCAT_IMPL_(s1, s2)

#define	OPEN3D_STRINGIFY_IMPL_(s) #s

#define	OPEN3D_STRINGIFY(s) OPEN3D_STRINGIFY_IMPL_(s)

#define	OPEN3D_GET_NTH_ARG_(...) OPEN3D_FIX_MSVC_(OPEN3D_GET_NTH_ARG_IMPL_(__VA_ARGS__))

#define	OPEN3D_GET_NTH_ARG_IMPL_(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10, N, ...) N

#define	OPEN3D_REVERSE_NUM_SEQUENCE_() 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0

#define	OPEN3D_NUM_ARGS(...) OPEN3D_GET_NTH_ARG_(__VA_ARGS__, OPEN3D_REVERSE_NUM_SEQUENCE_())

#define	OPEN3D_OVERLOAD(func, ...) OPEN3D_CONCAT(func, OPEN3D_NUM_ARGS(__VA_ARGS__))

Macro Definition Documentation

◆ OPEN3D_CONCAT

#define OPEN3D_CONCAT	(	s1,
		s2
	)	OPEN3D_CONCAT_IMPL_(s1, s2)

◆ OPEN3D_CONCAT_IMPL_

#define OPEN3D_CONCAT_IMPL_	(	s1,
		s2
	)	s1##s2

OPEN3D_CONCAT(s1, s2)

Concatenates the expanded expressions s1 and s2.

◆ OPEN3D_FIX_MSVC_

#define OPEN3D_FIX_MSVC_ ( ... ) __VA_ARGS__

OPEN3D_FIX_MSVC_(...)

Internal helper function which defers the evaluation of the enclosed expression.

Use this macro only to workaround non-compliant behaviour of the MSVC preprocessor.

Note: Could be dropped in the future if the compile flag /Zc:preprocessor can be applied.

◆ OPEN3D_GET_NTH_ARG_

#define OPEN3D_GET_NTH_ARG_ ( ... ) OPEN3D_FIX_MSVC_(OPEN3D_GET_NTH_ARG_IMPL_(__VA_ARGS__))

OPEN3D_NUM_ARGS(...)

Returns the number of supplied arguments.

Note: Only works for 1-10 arguments.

◆ OPEN3D_GET_NTH_ARG_IMPL_

#define OPEN3D_GET_NTH_ARG_IMPL_	(	arg1,
		arg2,
		arg3,
		arg4,
		arg5,
		arg6,
		arg7,
		arg8,
		arg9,
		arg10,
		N,
		...
	)	N

◆ OPEN3D_NUM_ARGS

#define OPEN3D_NUM_ARGS ( ... ) OPEN3D_GET_NTH_ARG_(__VA_ARGS__, OPEN3D_REVERSE_NUM_SEQUENCE_())

◆ OPEN3D_OVERLOAD

#define OPEN3D_OVERLOAD	(	func,
		...
	)	OPEN3D_CONCAT(func, OPEN3D_NUM_ARGS(__VA_ARGS__))

OPEN3D_OVERLOAD(func, ...)

Overloads the enumerated macros func1, func2, etc. based on the number of additional arguments.

Example:

#define FOO_1(x1) foo(x1)
#define FOO_2(x1, x2) bar(x1, x2)
#define FOO(...) '\'
    OPEN3D_FIX_MSVC_(OPEN3D_OVERLOAD(FOO_, __VA_ARGS__)(__VA_ARGS__))
FOO(1)    -> foo(1)
FOO(2, 3) -> bar(2, 3)

◆ OPEN3D_REVERSE_NUM_SEQUENCE_

#define OPEN3D_REVERSE_NUM_SEQUENCE_ ( ) 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0

◆ OPEN3D_STRINGIFY

#define OPEN3D_STRINGIFY ( s ) OPEN3D_STRINGIFY_IMPL_(s)

◆ OPEN3D_STRINGIFY_IMPL_

#define OPEN3D_STRINGIFY_IMPL_ ( s ) #s

OPEN3D_STRINGIFY(s)

Converts the expanded expression s to a string.