Flowdock
method

have_var

Importance_1
Ruby latest stable (v1_9_3_392) - 0 notes - Class: Object
have_var(var, headers = nil, &b) public

Returns whether or not the variable var can be found in the common header files, or within any headers that you provide. If found, a macro is passed as a preprocessor constant to the compiler using the variable name, in uppercase, prepended with ‘HAVE_’.

For example, if have_var(‘foo’) returned true, then the HAVE_FOO preprocessor macro would be passed to the compiler.

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