On 12/01/2021 3:12 AM, zack wrote:
A beginner question: How to pass strings properly to functions in D?
Is there any allocation going on if just use a function as "myPrint"? In
C++ I have often seen calls where one just passes a reference/const
reference to a string to avoid allocation.
C++:
void myPrintCPP(const std::string& input){ ... }
D:
void myPrint(string text){ ... }
void myPrintRef(ref string text) { ... }
If you are modifying text the reference and want the caller to see the
change, use this.
So the question is does a function call like (ref string ...)
(myPrintRef) make any sense in D to avoid additional allocations?
There are no allocations for this.
A D-Style String could be seen as "const(char)[]"? So as it is a slice
it already is a kind of reference to some data elsewhere? Which means
calling a function like "myPrint" in D wouldn't cause any allocation. Is
this correct?
alias string = immutable(char)[];
https://github.com/dlang/druntime/blob/master/src/object.d
