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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ip::address_v4::netmask

Obtain the netmask that corresponds to the address, based on its address class.

static address_v4 netmask(
    const address_v4 & addr);

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