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2.2.4 Type identification

Due to the fact that all variables are initialized to 0, and that many functions return 0 when failing, it's desirable to be able to determine what kind of value type you actually have received. Also, if you use the mixed type it's virtually essential to be able to test what the variable contains at times. For this purpose there's a special test function for each type that will return 1 (true) if the tested value is of the asked for type, and 0 if not.

@bullet{int intp(mixed)}

Test if given value is an integer

@bullet{int floatp(mixed)}

Test if given value is a float

@bullet{functionp(mixed)}

Test if given value is a function pointer

@bullet{int stringp(mixed)}

Test if given value is a string

@bullet{int objectp(mixed)}

Test if given value is an object pointer

@bullet{int mappingp(mixed)}

Test if given value is a mapping

@bullet{int pointerp(mixed)}

Test if given value is an array

NB! These functions test the type of the value, NOT the value itself in the sense of truth functionality. In other words intp(0) will always evaluate as true, as will mappingp(([])).