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proclaim (Function)

— Function: proclaim declaration-specifier implementation-dependent
Arguments and Values:

declaration-specifier—a declaration specifier.


Establishes the declaration specified by declaration-specifier in the global environment.

Such a declaration, sometimes called a global declaration or a proclamation, is always in force unless locally shadowed.

Names of variables and functions within declaration-specifier refer to dynamic variables and global function definitions, respectively.

The next figure shows a list of declaration identifiers that can be used with proclaim.

declaration inline optimize type
ftype notinline special

Figure 3.22: Global Declaration Specifiers

An implementation is free to support other (implementation-defined) declaration identifiers as well.

 (defun declare-variable-types-globally (type vars)
   (proclaim `(type ,type ,@vars))

 ;; Once this form is executed, the dynamic variable *TOLERANCE*
 ;; must always contain a float.
 (declare-variable-types-globally 'float '(*tolerance*))
See Also:

declaim, declare, Section 3.2 (Compilation)


Although the execution of a proclaim form has effects that might affect compilation, the compiler does not make any attempt to recognize and specially process proclaim forms. A proclamation such as the following, even if a top level form, does not have any effect until it is executed:

(proclaim '(special *x*))

If compile time side effects are desired, eval-when may be useful. For example:

 (eval-when (:execute :compile-toplevel :load-toplevel)
   (proclaim '(special *x*)))

In most such cases, however, it is preferrable to use declaim for this purpose.

Since proclaim forms are ordinary function forms, macro forms can expand into them.