AX_CXX_HAVE_CREF()
This macro checks if std::cref, added in C++11, is defined in the <functional> header.
If it is, define the ax_cv_cxx_have_cref environment variable to "yes" and define HAVE_CXX_CREF.
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Copyright © 2014 Enrico M. Crisostomo enrico.m.crisostomo@gmail.com
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