Where to put own functions for use in several classes

Philipp DE

Hi,

I need to create a function which I need to use in several windows. In PHP I could create a function anywhere any use it anywhere.

How can I do this in qt5?

Do I need to create a new class and create static functions or do I just create a new header and new cpp file and put the functions there, include the header and use them?

What will be the right way in qt5?

Kent-Dorfman

Both methods will work. The more accepted C++ way is to use static class methods and include the header where needed.

Christian Ehrlicher

@Kent-Dorfman said in Where to put own functions for use in several classes:

is to use static class methods and include the header where needed.

Then the function must not be static ...

aha_1980

@Christian-Ehrlicher said in Where to put own functions for use in several classes:

@Kent-Dorfman said in Where to put own functions for use in several classes:

is to use static class methods and include the header where needed.

Then the function must not be static ...

I think @Kent-Dorfman talked about static member functions, a la:

// Header
class Foo {
public:
  static void bar();
}

// C++ file
void Foo::bar()
{
 // ...
}

while you meant static functions:

// C++ file
static void bar()
{
}

which are indeed not visible outside this C++ file.

Uhm, C++ is hard, actually...

Regards

mpergand

Or using a namespace.

namespace MyVeryUsefullFunctions
{
    inline int Cube(int n ) { return n*n*n; }
}
...
using namespace  MyVeryUsefullFunctions;

int c=Cube(10);