#### ip::network_v4::make_network_v4

Create an IPv4 network from a string containing IP address and prefix length.

    network_v4 make_network_v4(
        const char * str);
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    network_v4 make_network_v4(
        const char * str,
        asio::error_code & ec);
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    network_v4 make_network_v4(
        const std::string & str);
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    network_v4 make_network_v4(
        const std::string & str,
        asio::error_code & ec);
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    network_v4 make_network_v4(
        string_view str);
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    network_v4 make_network_v4(
        string_view str,
        asio::error_code & ec);
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