lvalue method

[Simen kjaeraas]

Benjamin Thaut <code at benjamin-thaut.de> wrote:

> Hi, I'm writing a vec4 math struct and I have a method of which the  
> return value has to be a lvalue so I wonder which is the correct way to  
> do this:
>
> vec4 Normalize() const { ... } //won't work, not a lvalue
>
> ref vec4 Normalize() const {
>    vec4 temp;
>    ...
>    return temp;
> } //will this lead to a segfault or not?

Will simply not compile.
(Error: escaping reference to local variable temp)


> ref vec4 Normalize() const {
>    vec4* temp = new vec4;
>    ...
>    return *temp;
> } //ugly, don't want to allocate anything on the heap

This will work.


> auto ref vec4 Normalize() const {
>    vec4 temp;
>    ...
>    return temp;
> } //will this lead to a segfault?

The compiler will conclude that temp cannot be returned as ref, and
thus do a value return.


> Or do I need to do it totaly in some other way?

Don't know. Why does it have to be an lvalue?

-- 
Simen