Technical Difficulties » c http://greensoftware.net/blog Solving my problems Thu, 01 Jul 2010 16:46:16 +0000 en hourly 1 http://wordpress.org/?v=3.0 One good thing in Objective-C http://greensoftware.net/blog/2010/02/21/one-good-thing-in-objective-c/ http://greensoftware.net/blog/2010/02/21/one-good-thing-in-objective-c/#comments Sun, 21 Feb 2010 12:24:15 +0000 digitalSurgeon http://greensoftware.net/blog/?p=248 While learning about objective-c. I came across a single feature of objective-c which I think if moved to c++ would make for a lot less coding.

Consider this objective c code for a class declaration:

// .h file:
@interface classname {
// instance variables
}
+(void)classMethod;
@end

// .m file:
@implementation classname
-privateFunction1{}
-classMethod { [self privateFunction1]; }
@end

While if you would have to do something similar in c++, this is how you would do it:


// .h file:
class classname
{
public:
void classMethod();

private:
void privateFunction();
}

// .cpp file:

void classname::classMethod() { privateFunction(); }
void classname::privateFunction() {}

Even if a function in a C++ class is private, you still have to declare it in the class declaration. why ?
It would be so much better if all the private functions can just placed in the cpp file, and we dont have to put them in the class declaration.

Objective C has the benefit of using @implementation … @end to figure out such methods. But if in c++ if we just declare a function in the .cpp file and such function is not present in the class declaration, the compiler can know that its a private function. Like so:


// .h file:

class sample
{
public:
void doSomething();

private:
int x;
};

// .cpp file:

void sample::doSomethingPrivately()
{
// has access to member data.
x = 7;
}

void sample::doSomething()
{
/// ...
doSomethingPrivately();
}

]]> http://greensoftware.net/blog/2010/02/21/one-good-thing-in-objective-c/feed/ 3 c++ std::string http://greensoftware.net/blog/2009/07/10/c-stdstring/ http://greensoftware.net/blog/2009/07/10/c-stdstring/#comments Fri, 10 Jul 2009 18:28:30 +0000 digitalSurgeon http://greensoftware.net/blog/?p=192 the c++ string or more specifically std::string is a great improvement over the c-strings which are null terminated. c++ strings use a length fields to keep track of how long the string is as compared to c-string which use the NULL ‘\0′ character to keep track of where the string ends.

The c-strings have been around for so long and are used in so many places that when people start to use the std::string they get confused. For example today i wanted to use std::string to hold binary data, i knew that this was possible but i couldn’t figure out how. Then stack overflow came to the rescue. This question is explained very well there.

Thanks Stack Overflow :)

]]> http://greensoftware.net/blog/2009/07/10/c-stdstring/feed/ 0 Objective-C Stupidities #1 http://greensoftware.net/blog/2009/01/22/objective-c-stupidities-1/ http://greensoftware.net/blog/2009/01/22/objective-c-stupidities-1/#comments Thu, 22 Jan 2009 15:30:48 +0000 digitalSurgeon http://greensoftware.net/blog/2009/01/22/objective-c-stupidities-1/ -(int)changeColorToRed:(float)red green:(float)green blue:(float)blue

WTF ?

Source: http://en.wikipedia.org/wiki/Objective-C

]]> http://greensoftware.net/blog/2009/01/22/objective-c-stupidities-1/feed/ 0