TypeOfkeyword

Returns the type of a variable.

Syntax

TypeOf ( variable | datatype )

Parameters

Name		Description
`variable`		A variable of any type.
`datatype`		A DataType.

Description

TypeOf is a compiler intrinsic that replaces itself with the type of the variable passed to it. It can either be used in a variable declaration (Example 1) or it can be used in the preprocessor for comparison, printing. (Example 2)

TypeOf also supports passing any intrinsic data type, or user-defined type (and its data fields), not only variables defined as those types. Also supported are expressions, the type is inferred from the expression (much like Var).

If there is both a user defined type and a variable visible with the same name in the current scope, the user defined type takes precedence over the variable. To ensure that the TypeOf takes the variable instead of the user defined type, wrap the argument to TypeOf with parentheses to force it to be seen as an expression. For example Typeof((variable)).

Remarks

Version

Before fbc 1.10.0, TypeOf was not returning the type of the non-static member procedures of a UDT.
Before fbc 1.08.0:

TypeOf was not returning the type of the data fields of a UDT.
When a variable from a given namespace was accessed with the namespace's name prefix, the argument to TypeOf had to be wrapped with parentheses to force it to be seen as an expression. For example Typeof((namespace_name.variable)).

Dialect Differences

Not available in the -lang qb dialect unless referenced with the alias __Typeof.

Differences from QB

New to FreeBASIC

Example

Example 1:

Dim As Integer foo

Dim As TypeOf(67.2) bar '' '67.2' is a literal double

Dim As TypeOf( foo + bar ) teh_double '' double + integer results in double

Print SizeOf(teh_double)

Example 2:

Dim As String foo

#print TypeOf(foo)

#if TypeOf(foo) = TypeOf(Integer)

  #print "Never happened!"

#endif



#if TypeOf(foo) = TypeOf(String)

  #print "It's a String!"

#endif

Reference

Documented in KeyPgTypeof.html