topic "U++ Logging";
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[{_}%EN-US 
[ {{10000@(113.42.0) [s0; [*@7;4 U`+`+ Logging]]}}&]
[s0;i448;a25;kKO9;@(0.0.255)%- &]
[s0; U`+`+ logging infrastructure is based on output stream, which 
is capable of outputting log lines into decided output facilities 
(files, console output, syslog).&]
[s0; &]
[s0; Logging itself is then based on set o macros that output values 
to this stream, usually using AsString or operator<<(Stream`&, 
...) to convert values.&]
[s0; &]
[s0; This stream is accessible through UppLog() function and its 
default version is provided by U`+`+, however it can be replaced 
(using SetUppLog).&]
[s0; &]
[s0; Multithreading note: Standard log stream handles serialization 
of output in its implementation  (and any possible replacement 
should do that too), so it is possible to use single output stream 
in all threads.&]
[s0; &]
[ {{10000F(128)G(128)@1 [s0; [* Entity List]]}}&]
[s0;%- &]
[s5;:StdLogSetup`(dword`,const char`*`,int`):%- [@(0.0.255) void]_[* StdLogSetup]([_^dword^ d
word]_[*@3 options], [@(0.0.255) const]_[@(0.0.255) char]_`*[*@3 filepath]_`=_NULL, 
[@(0.0.255) int]_[*@3 filesize`_limit]_`=_[@3 10]_`*_[@3 1024]_`*_[@3 1024])&]
[s2; This function setups standard U`+`+ logging. [%-*@3 filepath] 
is the path of .log file (if logging to file is active), [%-*@3 filesize`_limit] 
is maximum size of log (if LOG`_FILE options is active), if achieved, 
a new log file is created. [%-*@3 options] is a combination of 
bit flags:&]
[s2; &]
[ {{2939:7061<288;^ [s0; LOG`_FILE ]
:: [s0; Output log to file (this is default). The default path of file 
is ConfigFile(`"[/ program`_name].log`").]
:: [s0; LOG`_COUT ]
:: [s0; Output log to standard output.]
:: [s0; LOG`_CERR ]
:: [s0; Output log to error output.]
:: [s0; LOG`_DBG ]
:: [s0; Output log to debugger (Win32 specific).]
:: [s0; LOG`_SYS ]
:: [s0; Output log to syslog (POSIX specific).]
:: [s0; LOG`_TIMESTAMP ]
:: [s0; Prepend local time timestamp to each log line (not with LOG`_SYS, 
as syslog already does this).]
:: [s0; LOG`_TIMESTAMP`_UTC]
:: [s0; Prepend universal time timestamp to each log line (not with 
LOG`_SYS).]
:: [s0; LOG`_APPEND ]
:: [s0; When starting a program, append log to existing file instead 
of replacing it.]
:: [s0; LOG`_ROTATE([*@3 x])]
:: [s0; When starting a new log file, up to [*@3 x] older logs is preserved 
(renamed with extension `'.1`', `'.2`' etc...).]
:: [s0; LOG`_ROTATE`_GZIP]
:: [s0; Older preserved log files are compresed using gzip (except the 
most recent log `'.1`'.]}}&]
[s3; &]
[s4;%- &]
[s5;:StdLog`(`):%- [_^Stream^ Stream][@(0.0.255) `&]_[* StdLog]()&]
[s2; Returns a reference to stadard log stream.&]
[s3;%- &]
[s4;%- &]
[s5;:LOG`_BEGIN:%- [@(0.0.255) const]_[@(0.0.255) char]_[* LOG`_BEGIN `= 
`'`\x1e`';]&]
[s2; Putting this character into standard log stream adds one tabelator 
of indentation to all subsequent lines (moves text `"right`").&]
[s3;%- &]
[s4;%- &]
[s5;:LOG`_END:%- [@(0.0.255) const]_[@(0.0.255) char]_[* LOG`_END `= `'`\x1f`';]&]
[s2; Putting this character into standard log stream removes one 
tabelator of indentation to all subsequent lines (moves text 
`"left`").&]
[s3;%- &]
[s4;%- &]
[s5;:UppLog`(`):%- [_^Stream^ Stream][@(0.0.255) `&]_[* UppLog]()&]
[s2; Returns a reference to [/ current] log stream.&]
[s3; &]
[s4;%- &]
[s5;:SetUppLog`(Stream`&`):%- [@(0.0.255) void]_[* SetUppLog]([_^Stream^ Stream][@(0.0.255) `&
]_[*@3 log])&]
[s2; Sets the current log stream to [%-*@3 log] (must be an object 
with global lifetime).&]
[s3; &]
[s0; &]
[s0; &]
[ {{10000F(128)G(128)@1 [s0; [* Logging macros]]}}&]
[s0; &]
[s0; Standard logging macros come in 3 basic flavors. `"Normal`" 
macros (LOG, DUMP, ...) only emit code in debug mode, `"Debugging`" 
macros (DLOG, DDUMP, ..., first letter is `'D`') only [*/ compile] 
in debug mode and their presence causes relase mode compilation 
to fail (this is to prevent any forgotten debugging macros in 
code) and finally `"Release`" macros (RLOG, RDUMP, ..., first 
letter is `'R`') produce output even in release mode.&]
[s0; &]
[ {{5000:5000^ [s0; LOG(x), DLOG(x), RLOG(x)]
:: [s0; Outputs a single line to log.]
:: [s0; DUMP(x), DDUMP(x), RDUMP(x)]
:: [s0; Outputs a variable `- adds a variable name before value `-  
defined as LOG(#x << `"`=`" << x)]
:: [s0; DUMPC(x), DDUMPC(x), RDUMPC(x)]
:: [s0; Outputs a Vector or Array or Index of values.]
:: [s0; DUMPM(x), DDUMPM(x), RDUMPM(x)]
:: [s0; Outputs a VectorMap or ArrayMap.]
:: [s0; TIMING(x), DTIMING(x), RTIMING(x)]
:: [s0; Establishes profiling timing inspector which profiles since 
definition till the end of block, profiling values are printed 
to log at the program exit.]
:: [s0; LOGHEX(x), DLOGHEX(x), RLOGHEX(x)]
:: [s0; Outputs value as hexadecimal dump, currently works with String.]
:: [s0; DUMPHEX(x), DDUMPHEX(x), RDUMPHEX(x)]
:: [s0; Outputs variable as hexadecimal dump, like LOGHEX but puts variable 
name into log.]}}&]
[s0; &]
[s0; In addition to this it is common practice to use `'local`' macros 
that can be switched on/off for given modules files; standard 
approach is to add&]
[s0; &]
[s0; #define LLOG(x)    // DLOG(x)&]
[s0; &]
[s0; at the start of files with local logging, then activate logging 
by uncommenting the DLOG.&]
[s0; &]
[s0; U`+`+ has also concept of `"modular`" logging, where specific 
logging macros can be created that are bound to some global boolean 
entity (usually INI`_BOOL). Creation of these modular logs is 
simplified by macro:&]
[s0; &]
[s0; #define [* LOG`_](flag, x)     do `{ if(flag) RLOG(x); `} while(false)&]
[s0; &]
[s0; One such predefined type exists, USRLOG, that is indended to 
log user actions (like opening windows, pressing keyboard keys) 
and can be activated by IniBool Ini`::user`_log (and also by setting 
user`_log`=true in .ini file):&]
[s0; &]
[s0; #define [* USRLOG](x)         LOG`_(Ini`::user`_log, x)&]
[s0; ]]