storage-class-specifier

Why can't the static and register storage classes be used together?

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问题 When defining a variable in the following manner: static register int a1 = 0; we get the error: error: multiple storage classes in declaration specifiers Is there any fundamental reason for this error? Why can't a variable be both stored in a register, and also be initialized only at start up/first call? It is possible to attach the register storage class to a global variable. <- edit: not true 回答1: If a compiler implemented what you wanted faithfully then it would tie up a CPU register for

Where in a declaration may a storage class specifier be placed?

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For example, let's consider the static storage class specifier. Here are a few examples of both valid and ill-formed uses of this storage class specifier: static int a; // valid int static b; // valid static int* c; // valid int static* d; // valid int* static e; // ill-formed static int const* f; // valid int static const* g; // valid int const static* h; // valid int const* static i; // ill-formed typedef int* pointer; static pointer j; // valid pointer static k; // valid (The declarations marked "valid" were accepted by Visual C++ 2012, g++ 4.7.2, and Clang++ 3.1. The declarations marked

What is the use of Static local variable when we can get a global variable at the same cost?

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In C ,what is the use of static storage class when an external variable can serve its purpose at the same cost ie. both occupy storage space in the data segment of the executable. I have much better scope with external variable.If i want the scope of external variable to be specific file i do not declare this variable else where.i see a lot of flexibility with a global variable that static local variable And we can refer to local static variable outside the function if we have the address of the variable.Memory for local static variable will be in Data segment not in the stack frame of the

extern storage class specifier

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问题 Section 7.1 of the C++ Standard mentions about 'extern' as a storage class specifier. N3126 - "The extern specifier can be applied only to the names of variables and functions. The extern specifier cannot be used in the declaration of class members or function parameters. For the linkage of a name declared with an extern specifier, see 3.5. [ Note: The extern keyword can also be used in explicit-instantiations and linkage-specifications, but it is not a storage-class-specifier in such

Can a variable be declared both static and extern?

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Why the following doesn't compile? ... extern int i; static int i; ... but if you reverse the order, it compiles fine. ... static int i; extern int i; ... What is going on here? This is specifically given as an example in the C++ standard when it's discussing the intricacies of declaring external or internal linkage. It's in section 7.1.1.7, which has this exert: static int b ; // b has internal linkage extern int b ; // b still has internal linkage extern int d ; // d has external linkage static int d ; // error: inconsistent linkage Section 3.5.6 discusses how extern should behave in this

Where in a declaration may a storage class specifier be placed?

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问题 For example, let's consider the static storage class specifier. Here are a few examples of both valid and ill-formed uses of this storage class specifier: static int a; // valid int static b; // valid static int* c; // valid int static* d; // valid int* static e; // ill-formed static int const* f; // valid int static const* g; // valid int const static* h; // valid int const* static i; // ill-formed typedef int* pointer; static pointer j; // valid pointer static k; // valid (The declarations

What is the use of Static local variable when we can get a global variable at the same cost?

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问题 In C ,what is the use of static storage class when an external variable can serve its purpose at the same cost ie. both occupy storage space in the data segment of the executable. I have much better scope with external variable.If i want the scope of external variable to be specific file i do not declare this variable else where.i see a lot of flexibility with a global variable that static local variable And we can refer to local static variable outside the function if we have the address of