Template meta programming helpers

Classes
struct	senf::mpl::nil
	Marker class for empty default values etc. More...
struct	senf::mpl::rv< n >
	Return-value type used to implement overload selection. More...
struct	senf::mpl::take_uint< _ >
	Take an arbitrary unsigned integer template argument. More...
struct	senf::mpl::take_int< _ >
	Take an arbitrary integer template argument. More...
struct	senf::mpl::take_class< _ >
	Take an arbitrary type template argument. More...
Defines
#define	SENF_MPL_RV(expr)
	Get return value of overload selector.
#define	SENF_MPL_SLOT_DEF(name, value)
	Define MPL slot.
#define	SENF_MPL_SLOT_SET(name, value)
	Set MPL slot.
#define	SENF_MPL_SLOT_GET(name)
	Get current MPL slot value.

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Define Documentation

#define
SENF_MPL_RV	(	expr		)

Get return value of overload selector.

Used together with senf::mpl::rv to implement overload selection.

See also:

senf::mpl::rv

Definition at line 128 of file mpl.hh.

#define
SENF_MPL_SLOT_DEF	(	name,
		value		)

Define MPL slot.

The slot macros SENF_MPL_SLOT_DEF(), SENF_MPL_SLOT_SET() and SENF_MPL_SLOT_GET() provide a facility to get the last unsigned integer value assigned to the slot before the current point in the current class.

struct Foo
{
    // Define SLOT slot named 'accum' initialized to 0
    SENF_MPL_SLOT_DEF(accum, 0);

    // Add 2 to 'accum'
    SENF_MPL_SLOT_SET(accum, SENF_MPL_SLOT_GET(accum) + 2);

    // Multiply 'accum' by 3
    SENF_MPL_SLOT_SET(accum, SENF_MPL_SLOT_GET(accum) * 3);

    // Define the result as a constant expression. result is now 6
    static unsigned result = SENF_MPL_SLOT_GET(accum);
};

Of course, it does not make sense to use these macros for simple arithmetic as in the example. The SENF_MPL_SLOT macros allow to define macros which pass information from one macro invocation to the next.

Implementation note:

The implementation is based on __LINE__: We check backwards for a value defined on a previous line. The check is limited to 80 lines backwards.

Definition at line 192 of file mpl.hh.

#define
SENF_MPL_SLOT_GET	(	name		)

Get current MPL slot value.

See also:

SENF_MPL_SLOT_DEF()

Definition at line 222 of file mpl.hh.

#define
SENF_MPL_SLOT_SET	(	name,
		value		)

Set MPL slot.

See also:

SENF_MPL_SLOT_DEF()

Definition at line 213 of file mpl.hh.