Macros
#define	BSLMF_TAG_TO_UINT(BSLMF_EXPR)

#define	BSLMF_TAG_TO_INT(BSLMF_EXPR) ((int)BSLMF_TAG_TO_UINT(BSLMF_EXPR))

#define	BSLMF_TAG_TO_BOOL(BSLMF_EXPR) (BSLMF_TAG_TO_INT(BSLMF_EXPR) != 0)

#define	bslmf_Tag bslmf::Tag
	This alias is defined for backward compatibility.

Detailed Description

Outline

Purpose
Classes
Macros
Description
- Macro Summary

Purpose

Provide an integral-constant-to-type conversion.

Classes

bslmf::Tag: map integral constants to C++ types

Macros

: BSLMF_TAG_TO_INT(EXPR): map tag to integral value : BSLMF_TAG_TO_BOOL(EXPR): map tag to boolean value

Description

This component defines a simple template structure used to map an integral constant to a C++ type. bslmf::Tag<unsigned> defines a different type for each distinct compile-time constant integral parameter. That is, instantiations with different integer values form distinct types, so that bslmf::Tag<0> is a distinct type from bslmf::Tag<1>, which, in turn, is also distinct from bslmf::Tag<2>, and so on.

This component also provides two macros for mapping a bslmf::Tag<t_N> instance to the integral value t_N (BSLMF_TAG_TO_INT), and to the boolean value t_N != 0 (BSLMF_TAG_TO_BOOL).

Macro Summary

This section provides a brief description of the macros defined in this component.

BSLMF_TAG_TO_INT(EXPR) Given an integral value, V, and an expression, EXPR, of type bslmf::Tag<V>, this macro returns a compile-time constant with the value V. EXPR is not evaluated at run-time.

BSLMF_TAG_TO_BOOL(EXPR) Given an integral value, V, and an expression, EXPR, of type bslmf::Tag<V>, this macro returns a compile-time constant with the value true or false, depending on the boolean value of V. EXPR is not evaluated at run-time.

Macro Definition Documentation

◆ bslmf_Tag

#define bslmf_Tag bslmf::Tag

◆ BSLMF_TAG_TO_BOOL

#define BSLMF_TAG_TO_BOOL ( BSLMF_EXPR ) (BSLMF_TAG_TO_INT(BSLMF_EXPR) != 0)

◆ BSLMF_TAG_TO_INT

#define BSLMF_TAG_TO_INT ( BSLMF_EXPR ) ((int)BSLMF_TAG_TO_UINT(BSLMF_EXPR))

◆ BSLMF_TAG_TO_UINT

#define BSLMF_TAG_TO_UINT ( BSLMF_EXPR )

Value:

(((sizeof(BSLMF_EXPR.d_upperSizeArray) - 1) << 16) \

| (sizeof(BSLMF_EXPR.d_lowerSizeArray) - 1))