CODEWITHSUNDEEP
copenglenumsreturn-valuedeclaration
CodeSeven
CodeSeven

Reputation: 307

what is a declaration(?) like "GLenum GlewInitResult = glewInit();" doing?

I'm hoping you readers wont mind answering my simple request here. 

GLenum GlewInitResult = glewInit();

I want to make sure I'm understanding this right.

Is GLenum setting GlewInitResult as a a uint?

And is GlewInitResult being assigned to only the return value of glewInit()?

Or to further ask, whats the difference between 

GLenum GlewInitResult = glewInit();

and

GLenum GlewInitResult = glewInit; //this statement gives me a type mismatch error

What does removing the parenthesis do in a declaration(?) like this?

Sorry if this is trivial question. I just want to make sure I'm grasping/understanding the overall concept of opengl programming with freeglut.

Upvotes: 0

Views: 201

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409472

It declares a variable named GlewInitResult and assigns the result of the function call glewInit to the variable.

You can see it as two steps:

  1. Declare variable
  2. Assign result of function call to variable

I.e. the same as

GLenum GlewInitResult;
GlewInitResult = glewInit();

This is very basic stuff, and should have been in the very first chapter of any C (or C++) book. It has nothing to do with OpenGL or the GLEW library.

As for your second question, the first calls the function glewInit and stores the returned result in the variable. The second tries to store a pointer to the function in the variable, and as the variable is declared of the wrong type you get an error.

Upvotes: 4

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