Operator Preprocessor Concatenate

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Operator ## (Preprocessor Concatenate)

Preprocessor operator to concatenate strings

Syntax

text##text

Description

This operator creates a new token by concatenating the texts at both sides of it. This text can be recognized by other macros and further expanded. One use, is to create a macro that expands to different macro names, variable names, and function names depending on the arguments received.

Note:

In macro/define's use '##_' to escape line continuation character '_' to allow multiple lines of macro expanded code to be combined into a single statement.

Remarks

Differences from QB

• New to FreeBASIC

See also

• Preprocessor

Examples

#define Concat(t,n) t##n

Print concat (12,34)

Dim Concat (hello,world) As Integer

Concat (hello,world)=99

Print helloworld

Output:

1234
99

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Category: Operators
Kind: operator

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.