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

Create an IPv4 network from an address and prefix length.

network_v4 make_network_v4(
    const address_v4 & addr,
    unsigned short prefix_len);
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Create an IPv4 network from an address and netmask.

network_v4 make_network_v4(
    const address_v4 & addr,
    const address_v4 & mask);
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