asio C++ library
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ip::address::is_v4

Get whether the address is an IP version 4 address. 

bool is_v4() const;
Copyright © 2003-2018 Christopher M. Kohlhoff

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

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