tree ca10cd3ded662b00b7b5ac59e59c009987b2c925
parent fa0fa3b0fa5a9d59c37b6edbc53cc21b7c2a16b0
author Ed Tanous <edtanous@google.com> 1617835200 -0700
committer Ed Tanous <edtanous@google.com> 1617903470 -0700

Implement operator /= for object_path

This probably should've been implemented as part of
fa0fa3b0fa5a9d59c37b6edbc53cc21b7c2a16b0 Implement path encoding and
decoding but alas, it was not.  This commit adds the relatively simple
operator/= overloads to object_path.  This allows calling code to do
operations like:

object_path myPath("/foo");
myPath /= "bar";

Which would result in the object path /foo/bar.

In the implementation, this actually just calls into operator/, and does
a relatively naive replace of the content in the new object.  Given how
the sd_bus_path_encode API is organized, there doesn't appear to be a
way to call into it and "append" to an existing thing, so constructing a
new string and assigning it to the current object was the best I could
come up with in terms of efficiency.

This includes overloads for both const char* and const std::string&,
both of which have essentially the same behavior.

Tested:
New unit tests included in commit, and pass.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Idfb7f7f2dc94ea3773841c9ae62cd671327db2cd