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Make logging cost free when there is no output target (#12247)

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The logging streams now do almost no work when there is no output target for them.

For example, if LL_VERBOSE has no output targets, then `verbosestream << x` will return a StreamProxy with a null target. Any further `<<` operations applied to it will do nothing.
This commit is contained in:
paradust7
2022-05-04 11:55:01 -07:00
committed by GitHub
parent ae7664597e
commit 0704ca0550
14 changed files with 336 additions and 192 deletions
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5
builtin/settingtypes.txt
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@@ -1468,7 +1468,8 @@ language (Language) enum ,be,bg,ca,cs,da,de,el,en,eo,es,et,eu,fi,fr,gd,gl,hu,i
# - action
# - info
# - verbose
debug_log_level (Debug log level) enum action ,none,error,warning,action,info,verbose
# - trace
debug_log_level (Debug log level) enum action ,none,error,warning,action,info,verbose,trace
# If the file size of debug.txt exceeds the number of megabytes specified in
# this setting when it is opened, the file is moved to debug.txt.1,
@@ -1477,7 +1478,7 @@ debug_log_level (Debug log level) enum action ,none,error,warning,action,info,ve
debug_log_size_max (Debug log file size threshold) int 50
# Minimal level of logging to be written to chat.
chat_log_level (Chat log level) enum error ,none,error,warning,action,info,verbose
chat_log_level (Chat log level) enum error ,none,error,warning,action,info,verbose,trace
# Enable IPv6 support (for both client and server).
# Required for IPv6 connections to work at all.