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How do I trim leading/trailing whitespace in a standard way?
...t was allocated. The return
// value must NOT be deallocated using free() etc.
char *trimwhitespace(char *str)
{
char *end;
// Trim leading space
while(isspace((unsigned char)*str)) str++;
if(*str == 0) // All spaces?
return str;
// Trim trailing space
end = str + strlen(str) - ...
Why does the default parameterless constructor go away when you create one with parameters
...you accidentally end up not excluding it, you can screw up your invariants etc.
– Jon Skeet
Aug 3 '12 at 8:56
2
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Draw in Canvas by finger, Android
...onCreate(savedInstanceState);
dv = new DrawingView(this);
setContentView(dv);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.GREEN);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJo...
How do you add an in-app purchase to an iOS application?
... are not authorized to make payments,
// due to parental controls, etc
}
}
// Call this when you want to restore all purchases
// regardless of the productID you gave to the initializer
public func beginRestorePurchases(){
// restore purchases, and give responses to self
SKPayme...
What is JSONP, and why was it created?
...e codes back. As a result, you end up using timers to monitor the request, etc, which is always a bit suspect. The proposition for JSONRequest is a great solution to allowing cross domain scripting, maintaining security, and allowing proper control of the request.
These days (2015), CORS is the rec...
No == operator found while comparing structs in C++
...cs of your MyStruct1 below.
A consistent approach to ==, <, > <= etc
It's easy to leverage std::tuple's comparison operators to compare your own class instances - just use std::tie to create tuples of references to fields in the desired order of comparison. Generalising my example from h...
How to initialize log4j properly?
...sed to initialize itself, which loggers / appenders got configured and how etc.
The configuration file can be a java properties file or an xml file. Here is a sample of the properties file format taken from the log4j intro documentation page:
log4j.rootLogger=debug, stdout, R
log4j.appender.stdo...
Rails Observer Alternatives for 4.0
...cation (consider nested forms, model business logic updating associations, etc.)
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How do you prevent IDisposable from spreading to all your classes?
... IDisposable have to dispose these, so they have to be disposable as well, etc. The only way to avoid it is to:
avoid using IDisposable classes where possible, lock or wait for events in single places, keep expensive resources in single place, etc
create them only when you need them and dispose th...
Debug code-first Entity Framework migration codes
...ep#3: Open a console inside the output directory (/bin/Debug, /bin/Release etc) containing the dll of your migrations
Step#4: Invoke migrate.exe with the /scriptFile parameter to launch the debugger and actually debug the desired db-migration
migrate.exe "Your.Migrations.Assembly.dll" /scriptFile=...