23 General utilities library [utilities]

23.15 Metaprogramming and type traits [meta]

23.15.7 Transformations between types [meta.trans]

23.15.7.3 Sign modifications [meta.trans.sign]

Table 47 — Sign modifications
Template
Comments
template <class T>
struct make_­signed;
If T names a (possibly cv-qualified) signed integer type then the member typedef type names the type T; otherwise, if T names a (possibly cv-qualified) unsigned integer type then type names the corresponding signed integer type, with the same cv-qualifiers as T; otherwise, type names the signed integer type with smallest rank for which sizeof(T) == sizeof(type), with the same cv-qualifiers as T.

Requires: T shall be a (possibly cv-qualified) integral type or enumeration but not a bool type.
template <class T>
struct make_­unsigned;
If T names a (possibly cv-qualified) unsigned integer type then the member typedef type names the type T; otherwise, if T names a (possibly cv-qualified) signed integer type then type names the corresponding unsigned integer type, with the same cv-qualifiers as T; otherwise, type names the unsigned integer type with smallest rank for which sizeof(T) == sizeof(type), with the same cv-qualifiers as T.

Requires: T shall be a (possibly cv-qualified) integral type or enumeration but not a bool type.