Hello simendsjo,
The spec is very short here, and the example doesn't give me much..
// I thought "allows functinos to return by reference" meant it could
return local variables..
ref int* ptr() {
auto p = new int;
*p = 12;
return p; // Error: escaping local variable
}
// So whats the difference between these functions?
Just guessing but I'd guess that acts much like C++'s ref:
int*& Fn() { ... } // return a reference to a pointer to an int.
ref int val() {
auto p = new int;
assert(*p == 0);
*p = 10;
assert(*p == 10);
return *p;
}
Return a reference to an int (that is also pointed to by a local variable)
who's value is 10
int val2() {
auto p = new int;
*p = 10;
return *p;
}
Return the value (10) of an int that is pointed to by a local variable.
unittest
{
assert(val() == 10);
assert(val2() == 10);
auto retvalue = val() = 99; // References can be lvalues.. What?
The main point of references is that they can be lvalues.
assert(retvalue == 99);
}
--
... <IXOYE><
