net/SocketAddress: light wrapper for struct sockaddr

src/net/SocketAddress.hxx

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2012-2015 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SOCKET_ADDRESS_HXX
+#define SOCKET_ADDRESS_HXX
+
+#include "Compiler.h"
+
+#include <cstddef>
+
+#ifdef WIN32
+#include <winsock2.h>
+#else
+#include <sys/socket.h>
+#endif
+
+/**
+ * An OO wrapper for struct sockaddr.
+ */
+class SocketAddress {
+public:
+#ifdef WIN32
+	typedef int size_type;
+#else
+	typedef socklen_t size_type;
+#endif
+
+private:
+	const struct sockaddr *address;
+	size_type size;
+
+public:
+	SocketAddress() = default;
+
+	constexpr SocketAddress(std::nullptr_t):address(nullptr), size(0) {}
+
+	constexpr SocketAddress(const struct sockaddr *_address,
+				size_type _size)
+		:address(_address), size(_size) {}
+
+	static constexpr SocketAddress Null() {
+		return nullptr;
+	}
+
+	constexpr bool IsNull() const {
+		return address == nullptr;
+	}
+
+	const struct sockaddr *GetAddress() const {
+		return address;
+	}
+
+	constexpr size_type GetSize() const {
+		return size;
+	}
+
+	constexpr int GetFamily() const {
+		return address->sa_family;
+	}
+
+	/**
+	 * Does the object have a well-defined address?  Check !IsNull()
+	 * before calling this method.
+	 */
+	bool IsDefined() const {
+		return GetFamily() != AF_UNSPEC;
+	}
+
+	gcc_pure
+	bool operator==(const SocketAddress other) const;
+
+	bool operator!=(const SocketAddress other) const {
+		return !(*this == other);
+	}
+};
+
+#endif