#### ip::network_v4::network_v4

Default constructor.

    network_v4();
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Construct a network based on the specified address and prefix length.

    network_v4(
        const address_v4 & addr,
        unsigned short prefix_len);
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Construct network based on the specified address and netmask.

    network_v4(
        const address_v4 & addr,
        const address_v4 & mask);
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Copy constructor.

    network_v4(
        const network_v4 & other);
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