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How to make a SIMPLE C++ Makefile
...wer than support.o, and if so run a command like
g++ -g -c -pthread -I/sw/include/root support.cc
Check if either support.hh or tool.cc are newer than tool.o, and if so run a command like
g++ -g -c -pthread -I/sw/include/root tool.cc
Check if tool.o is newer than tool, and if so run a command l...
Can virtual functions have default parameters?
...ruct are exactly the same in almost every way except default visibility.
#include <string>
#include <sstream>
#include <iostream>
#include <iomanip>
using std::stringstream;
using std::string;
using std::cout;
using std::endl;
struct Base { virtual string Speak(int n = 42)...
How to debug Ruby scripts [closed]
...ngle line that doesn't do what you expect it to do. For example
[1, 2, 3].include?([1,2])
gives a value of false, even though you'd think it'd return true. In that case, you may want to look at the documentation. Web sites for documentation include ruby-doc.org, or APIdock. In the latter case, yo...
Exif manipulation library for python [closed]
...d tools aims at extracting EXIF information from Jpeg and Tiff files which include it. This information is typically included in images created using digital imaging devices such as digital cameras, digital film scanners, etc.
However, it looks like pyexif hasn't been updated in quite while. They...
What is the tilde (~) in the enum definition?
...ator can be found in pretty much any language that borrowed syntax from C, including Objective-C/C++/C#/Java/Javascript.
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How to find if a given key exists in a C++ std::map
...
C++20 gives us std::map::contains to do that.
#include <iostream>
#include <string>
#include <map>
int main()
{
std::map<int, std::string> example = {{1, "One"}, {2, "Two"},
{3, "Three"}, {42, "Don\'t Pani...
Django: Why do some model fields clash with each other?
... problem in abstract base classes,
since the fields on this class are
included into each of the child
classes, with exactly the same values
for the attributes (including
related_name) each time.
More info here.
...
Loop through an array of strings in Bash?
...
None of those answers include a counter...
#!/bin/bash
## declare an array variable
declare -a array=("one" "two" "three")
# get length of an array
arraylength=${#array[@]}
# use for loop to read all values and indexes
for (( i=1; i<${arrayl...
Django dynamic model fields
...NB) more compact than Hstore.
Several packages implement JSON/JSONB fields including django-pgfields, but as of Django 1.9, JSONField is a built-in using JSONB for storage.
JSONField is similar to HStoreField, and may perform better with large dictionaries. It also supports types other than strings...