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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Create an IPv4 address from an IP address string in dotted decimal form.

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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