Tommi fef0500aa7 Adding a new string utility class: SimpleStringBuilder. ... This is a fairly minimalistic string building class that can be used instead of stringstream, which is discouraged but tempting to use due to its convenient interface and familiarity for anyone using our logging macros. As a starter, I'm changing the string building code in ReceiveStatisticsProxy and SendStatisticsProxy from using stringstream and using SimpleStringBuilder instead. In the case of SimpleStringBuilder, there's a single allocation, it's done on the stack (fast), and minimal code is required for each concatenation. The developer is responsible for ensuring that the buffer size is adequate but the class won't overflow the buffer. In dcheck-enabled builds, a check will go off if we run out of buffer space. As part of using SimpleStringBuilder for a small part of rtc::LogMessage, a few more changes were made: - SimpleStringBuilder is used for formatting errors instead of ostringstream. - A new 'noop' state has been introduced for log messages that will be dropped. - Use a static (singleton) noop ostream object for noop logging messages instead of building up an actual ostringstream object that will be dropped. - Add a LogMessageForTest class for better state inspection/testing. - Fix benign bug in LogTest.Perf, change the test to not use File IO and always enable it. - Ensure that minimal work is done for noop messages. - Remove dependency on rtc::Thread. - Add tests for the extra_ field, correctly parsed paths and noop handling. Bug: webrtc:8529, webrtc:4364, webrtc:8933 Change-Id: Ifa258c135135945e4560d9e24315f7d96f784acb Reviewed-on: https://webrtc-review.googlesource.com/55520 Commit-Queue: Tommi <tommi@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Jonas Olsson <jonasolsson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22203}		2018-02-27 13:37:39 +00:00
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string_builder.h	Adding a new string utility class: SimpleStringBuilder.	2018-02-27 13:37:39 +00:00
string_builder_unittest.cc	Adding a new string utility class: SimpleStringBuilder.	2018-02-27 13:37:39 +00:00