The programs you’ve seen so far use identifiers for variable names and functions. The attributes of variables include name, type, size and value. Each identifier in a program also has other attributes, including storage duration, scope and linkage.
C++ provides five storage-class specifiers that determine a variable’s storage duration: register, extern, mutable and static. This section discusses storage-class specifiers register
, extern
and static
. Storage-class specifier mutable
is used exclusively with classes and thread_local
is used in multithreaded applications—these are discussed in Chapters 21 and 24, respectively.
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