Automatic lvalue in functions

[dogpuke@gmail.com]

I have a number of functions that return structs. Some sample calls:
mystruct = func_one(mystru ct, var1, var2);
mystruct = func_two(mystru ct, whatever, scale, thirdvar);

In every call, I'm passing the lvalue mystruct. I think it makes the
code repetitive and cluttered to have the lvalue listed as a parameter
on every function call.

I would rather have:
mystruct = func_one(var1, var2);
mystruct = func_two(whatev er, scale, thirdvar);

Yet still be able to access the lvalue within the function. Is there a
way using the preprocessor or some other trick to accomplish this? If
it were the preprocessor, it could parse this line:
mystruct = func_one(var1, var2);

Find the value to the left of the = and insert it with a comma after
func_one(

Is there a way to do this?

[TB]

Re: Automatic lvalue in functions

dogpuke@gmail.c om sade:[color=blue]
> I have a number of functions that return structs. Some sample calls:
> mystruct = func_one(mystru ct, var1, var2);
> mystruct = func_two(mystru ct, whatever, scale, thirdvar);
>
> In every call, I'm passing the lvalue mystruct. I think it makes the
> code repetitive and cluttered to have the lvalue listed as a parameter
> on every function call.
>
> I would rather have:
> mystruct = func_one(var1, var2);
> mystruct = func_two(whatev er, scale, thirdvar);
>
> Yet still be able to access the lvalue within the function. Is there a
> way using the preprocessor or some other trick to accomplish this? If
> it were the preprocessor, it could parse this line:
> mystruct = func_one(var1, var2);
>
> Find the value to the left of the = and insert it with a comma after
> func_one(
>
> Is there a way to do this?
>[/color]

What's stopping you from making them member functions?

--
TB @ SWEDEN

[Zara]

Re: Automatic lvalue in functions

On 21 Jan 2006 07:28:12 -0800, dogpuke@gmail.c om wrote:
[color=blue]
>I have a number of functions that return structs. Some sample calls:
>mystruct = func_one(mystru ct, var1, var2);
>mystruct = func_two(mystru ct, whatever, scale, thirdvar);
>
>In every call, I'm passing the lvalue mystruct. I think it makes the
>code repetitive and cluttered to have the lvalue listed as a parameter
>on every function call.
>
>I would rather have:
>mystruct = func_one(var1, var2);
>mystruct = func_two(whatev er, scale, thirdvar);
>
>Yet still be able to access the lvalue within the function. Is there a
>way using the preprocessor or some other trick to accomplish this? If
>it were the preprocessor, it could parse this line:
>mystruct = func_one(var1, var2);
>
>Find the value to the left of the = and insert it with a comma after
>func_one(
>
>Is there a way to do this?[/color]


Apart from making it a memeber function (as noted by TB), you may just
pass a non-const refrence to the struct:

void func_one (type_of_mystru ct& mystruct, type1 var1, type2 var2);

You may the modify mystruct within func_one. But the syntax of calling
would be:

func_one(mystru ct,var1,var2)

and not the one you desire.

*AND* it is much, much better, to make it a member function.

Zara