Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
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Coding Standards
This is an older version of Boost and was released in 2014. The current version is 1.89.0.
boost::proto::functional::env_var::result
// In header: <boost/proto/transform/env.hpp>
template<typename Sig>
struct result {
// types
typedef see-below type;
};
Encodes the return type of proto::functional::env_var::operator().
The presence of this member template makes proto::functional::env_var
a valid TR1-style function object type usable with boost::result_of<>.