counter ( variable -- n )

Vocabulary

namespaces

Inputs

variable

a variable, by convention a symbol

Outputs

n	an integer

Word description

Increments the value of the variable by 1, and returns its new value.

Notes

This word is useful for generating (somewhat) unique identifiers. For example, the gensym word uses it.

Side effects

Modifies variable

Definition

USING: kernel math ;

IN: namespaces

: counter ( variable -- n ) [ 0 or 1 + dup ] change-global ;
    inline