Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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Compare addresses for ordering.
bool operator<=( const address & a1, const address & a2);
Header: boost/asio/ip/address.hpp
Convenience header: boost/asio.hpp