This macros checks if std::is_bind_expression, added in C++11, is defined in the <functional> header.
If it is, define the ax_cv_cxx_have_is_bind_expression environment variable to "yes" and define HAVE_CXX_IS_BIND_EXPRESSION.
NOTE: This macros depends on AX_CXX_NAMESPACES.
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Copyright © 2014 Enrico M. Crisostomo firstname.lastname@example.org
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