Diff: ros/message_forward.h

Revision:

11:2228e8931266

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ros/message_forward.h	Thu Jul 11 13:30:27 2019 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2009, Willow Garage, Inc.
+ *
+ * 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.
+ *   * Neither the names of Willow Garage, Inc. nor the names of its
+ *     contributors may be used to endorse or promote products derived from
+ *     this software without specific prior written permission.
+ *
+ * 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 COPYRIGHT OWNER 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 ROSLIB_MESSAGE_FORWARD_H
+#define ROSLIB_MESSAGE_FORWARD_H
+
+// Make sure that either __GLIBCXX__ or _LIBCPP_VERSION is defined.
+#include <cstddef>
+
+// C++ standard section 17.4.3.1/1 states that forward declarations of STL types
+// that aren't specializations involving user defined types results in undefined
+// behavior. Apparently only libc++ has a problem with this and won't compile it.
+#ifndef _LIBCPP_VERSION
+namespace std
+{
+template<typename T> class allocator;
+}
+#else
+#include <memory>
+#endif
+
+namespace boost
+{
+template<typename T> class shared_ptr;
+}
+
+/**
+ * \brief Forward-declare a message, including Ptr and ConstPtr types, with an allocator
+ *
+ * \param msg The "base" message type, i.e., the name of the .msg file
+ * \param new_name The name you'd like the message to have
+ * \param alloc The allocator to use, e.g. std::allocator
+ */
+#define ROS_DECLARE_MESSAGE_WITH_ALLOCATOR(msg, new_name, alloc) \
+  template<class Allocator> struct msg##_; \
+  typedef msg##_<alloc<void> > new_name; \
+  typedef boost::shared_ptr<new_name> new_name##Ptr; \
+  typedef boost::shared_ptr<new_name const> new_name##ConstPtr;
+
+/**
+ * \brief Forward-declare a message, including Ptr and ConstPtr types, using std::allocator
+ * \param msg The "base" message type, i.e. the name of the .msg file
+ */
+#define ROS_DECLARE_MESSAGE(msg) ROS_DECLARE_MESSAGE_WITH_ALLOCATOR(msg, msg, std::allocator)
+
+#endif // ROSLIB_MESSAGE_FORWARD_H
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