Writing register storage class is simply a request to the compiler so variable may not be stored in CPU registers if they are not free/available.只是请求,未必最后存储寄存器 You will never come to know whether variables are stored within register or within memory.没法知道它最后是否存储在寄存器还是...
参考:https://en.cppreference.com/w/c/language/storage_duration storage-class specifier 简介 1、 At most one specifier may be used, except that _Thread_local may be combined with static or extern to adjust linkage (since C11). 除了_Thread_local 可以和 extern static 搭配使用外,存储类型 指示...
There are four storage classes in C they are as follows: Automatic Storage Class Register Storage Class Static Storage Class External Storage ClassNow, let us discuss these storage classes one by one. 1. Automatic Storage ClassA variable defined within a function or block with auto specifier ...
You can use any of four storage-class-specifier terminals for variable declarations at the internal level. When you omit the storage-class-specifier from such a declaration, the default storage class is auto. Therefore, the keyword auto is rarely seen in a C program. See Also Reference C St...
Thetypedefandconstexpr(since C23)specifiers are formally listed as storage-class specifiers in the C language grammar, but do not specify storage. The auto specifier is also used for type inference. (since C23) Names at file scope that areconstand notexternhave external linkage in C (as the...
storage-class specifier 逐个说明 auto - automatic duration and no linkage。 被auto 存储类型限定的 标识符 ,具有 none linkage ,具有automatic duration 说明: 通常,函数块作用域内的 即没有被 static 修饰,又每当有被 extern修饰 的标识符 ,才具有 none linkage。 在这种情况下,不使用auto 修饰,和时有auto...
The C++ storage-class specifiers tell the compiler the duration and visibility of the object or function they declare, as well as where an object should be stored.The following are storage class specifiers:Copy <A HREF="_pluslang_the_auto_keyword.htm">auto</A> <A HREF="_pluslang_the_...
I'm a foreigner reading C99, while a sentence (in 6.7.1) makes me confused: '(A declaration of an identifier for an object with storage-class specifier register suggests that access to the object be as fast as possible.)The extent to which such suggestions are effective is implementation-...
C provides the following storage-class specifiers:Syntaxstorage-class-specifier: auto register static extern typedef __declspec ( extended-decl-modifier-seq ) /* Microsoft-specific */Except for __declspec, you can use only one storage-class-specifier in the declaration-...
In variable declarations at the external level (that is, outside all functions), you can use the static or extern storage-class specifier or omit the storage-class specifier entirely. You cannot use the auto and register storage-class-specifier terminals at the external level....