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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...r particular processor (and the same applies to -Os). If you try the same example on different processors, you will find that on some of them benefit from -O2 while other are more favorable to -Os optimizations.
Here are the results for time ./test 0 0 on several processors (user time reported):
P...
Equivalent of “continue” in Ruby
...e is a continue keyword that, when used inside of a loop, jumps to the next iteration of the loop. Is there any equivalent of this continue keyword in Ruby?
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int to hex string
I need to convert an int to hex string.
4 Answers
4
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How do I resolve cherry-pick conflicts using their changes?
...ir changes not yours, so make this:
git cherry-pick --strategy=recursive -X theirs {Imported_Commit}
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Set transparent background using ImageMagick and commandline prompt
...until I realized JPG won't do transparent. Once I switched to PNG it did exactly what I wanted - just had to change "white" to "rgb($r,$g,$b)".
– Roger Dueck
Feb 9 '16 at 22:41
3
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Vagrant error: NFS is reporting that your exports file is invalid
...
Try using the known good versions of VirtualBox and Vagrant noted in Discourse as Your First Rails App:
Vagrant 1.1.2
VirtualBox 4.2.10
I was having the same issue on Mac (OS X 10.9 (Mavericks)), but rolling back to these versions seemed to fix it for me.
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How does a language expand itself? [closed]
...nner core of pure hardware to the outermost application layer. Each layer exposes parts of itself to the next outer layer, so that the outer layer may use some of the inner layers functionality.
In the case of e.g. Windows the operating system exposes the so-called WIN32 API for applications runnin...
Is “else if” a single keyword?
...tement containing the original substatement.
and provides the following example:
if (x)
int i;
can be equivalently rewritten as
if (x) {
int i;
}
So how is your slightly extended example parsed?
if
statement_0;
else
if
statement_1;
else
if
statement_2 ;
will be p...
Where does Visual Studio look for C++ header files?
...ssor in VS 2010 looks into the current dir only if the quoted include syntax is used (e.g #include "whatever.h"). Using angle brackets (e.g #include <whatever.h>) omits the current dir ( msdn.microsoft.com/en-us/library/36k2cdd4(v=VS.100).aspx )
– Dennis Münkle
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#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular s
...hy:
First, you can use DEBUG_ENABLED in preprocessor and compiled tests. Example - Often, I want longer timeouts when debug is enabled, so using #if, I can write this
DoSomethingSlowWithTimeout(DEBUG_ENABLED? 5000 : 1000);
... instead of ...
#ifdef DEBUG_MODE
DoSomethingSlowWithTimeout(5000...