This macro checks if std::function, added in C++11, is defined in the <functional> header.
If it is, define the ax_cv_cxx_have_function environment variable to "yes" and define HAVE_CXX_FUNCTION.
Download the latest version of ax_cxx_have_function.m4 or browse the macro’s revision history.
Copyright © 2014 Enrico M. Crisostomo firstname.lastname@example.org
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.