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log4j logging hierarchy order
... you will see how the log works in each level. i.e for WARN, (FATAL, ERROR and WARN) will be visible. For OFF, nothing will be visible.
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NSObject +load and +initialize - What do they do?
I'm interested in understanding the circumstances leading a developer to override +initialize or +load. Documentation makes it clear these methods are called for you by the Objective-C runtime, but that's really all that is clear from the documentation of those methods. :-)
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What's the difference between a continuation and a callback?
... browsing all over the web in search of enlightenment about continuations, and it's mind boggling how the simplest of explanations can so utterly confound a JavaScript programmer like myself. This is especially true when most articles explain continuations with code in Scheme or use monads.
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How to Compare Flags in C#?
...t be an issue for some people. Happily not for me.
– Andy Mortimer
Nov 18 '11 at 10:58
2
The perf...
Correct way to quit a Qt program?
How should I quit a Qt Program, e.g when loading a data file, and discovered file corruption, and user need to quit this app or re-initiate data file?
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What is the difference between packaged_task and async
...nces if you use a rather long function, such as
//! sleeps for one second and returns 1
auto sleep = [](){
std::this_thread::sleep_for(std::chrono::seconds(1));
return 1;
};
Packaged task
A packaged_task won't start on it's own, you have to invoke it:
std::packaged_task<int()> tas...
Why do we need argc while there is always a null at the end of argv?
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And argc could be quite big, because the shell is doing expansion (so in ls * the * is expanded by the shell before execve of /bin/ls executable). On my system, I can have an argc of several hundred thousands.
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Jackson and generic type reference
...is a well-known problem with Java type erasure: T is just a type variable, and you must indicate actual class, usually as Class argument. Without such information, best that can be done is to use bounds; and plain T is roughly same as 'T extends Object'. And Jackson will then bind JSON Objects as Ma...
Get all git commits since last tag
...th commit id + message, then
git log <yourlasttag>..HEAD --oneline
and in case you don't know your latest tag or want this to be dynamic, on windows you could do
for /f "delims=" %a in ('git describe --tags --abbrev^=0') do @set latesttag=%a
git log %latesttag%..HEAD --oneline
and on linu...
How to get names of enum entries?
I would like to iterate a TypeScript an enum type and get each enumerated symbol name, e.g.:
28 Answers
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