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int const max = 15; int a[max]; /* invalid declaration outside of a function */ int const *p; p = &max; /* a const-qualified object can have its address taken */ p = &max; |
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{{const}}\-qualified objects are likely to incur some runtime overhead \[[Saks 01b|AA. C References#Saks 02]\]. Most C compilers, for example, allocate memory for {{const}}\-qualified objects. {{const}}\-qualified objects declared inside a function body may have automatic storage duration. If so the compiler will allocate storage for the object, and it will be on the stack. As a result, this storage will need to be allocated and initialized each time the containing function is invoked. |
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