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Exploring Docker container's file system
...at I need to understand what's happening inside a container or what files exist in there. One example is downloading images from the docker index - you don't have a clue what the image contains so it's impossible to start the application.
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How to get current time and date in C++?
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In C++ 11 you can use std::chrono::system_clock::now()
Example (copied from en.cppreference.com):
#include <iostream>
#include <chrono>
#include <ctime>
int main()
{
auto start = std::chrono::system_clock::now();
// Some computation here
auto en...
django-debug-toolbar not showing up
...h with it, all your visitors will get to see your debug toolbar too.
For explicit configuration, also see the official install docs here.
EDIT(6/17/2015):
Apparently the syntax for the nuclear option has changed. It's now in its own dictionary:
def show_toolbar(request):
return True
DEBUG_TO...
Change date format in a Java string
... per your failed attempt: the patterns are case sensitive. Read the java.text.SimpleDateFormat javadoc what the individual parts stands for. So stands for example M for months and m for minutes. Also, years exist of four digits yyyy, not five yyyyy. Look closer at the code snippets I posted here abo...
Single vs Double quotes (' vs ")
... edited Mar 3 '10 at 16:50
Blixt
46.2k1111 gold badges105105 silver badges149149 bronze badges
answered Mar 3 '10 at 16:49
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How to pattern match using regular expression in Scala?
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You can do this because regular expressions define extractors but you need to define the regex pattern first. I don't have access to a Scala REPL to test this but something like this should work.
val Pattern = "([a-cA-C])".r
word.firstLetter match {
cas...
How to make a Bootstrap accordion collapse when clicking the header div?
In a Bootstrap accordion, instead of requiring a click on the a text, I want to make it collapse when clicking anywhere in the panel-heading div.
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Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
... warnings. But as for clarity, I find while clearer than for in this context. I guess that aspect just comes down to personal preference.
– Tim
Apr 9 '10 at 23:28
14
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How can I use “sizeof” in a preprocessor macro?
...t want to get a compile-time error when sizeof(something) is not what you expect, you can use following macro:
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
Usage:
BUILD_BUG_ON( sizeof(someThing) != PAGE_SIZE );
This article explains in details why it works.
3. MS-...
What does git push -u mean?
...sion, git push does not have the -u option. It only appears in the 1.7.x version.
2 Answers
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