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Function std.functional.toDelegate
Convert a callable to a delegate with the same parameter list and return type, avoiding heap allocations and use of auxiliary storage.
auto auto toDelegate(F)
(
auto ref F fp
)
if (isCallable!F);
Parameters
| Name | Description |
|---|---|
| fp | a function pointer or an aggregate type with opCall defined. |
Returns
A delegate with the context pointer pointing to nothing.
Example
void doStuff() {
writeln("Hello, world.");
}
void runDelegate(void delegate() myDelegate) {
myDelegate();
}
auto delegateToPass = toDelegate(&doStuff);
runDelegate(delegateToPass); // Calls doStuff, prints "Hello, world."BUGS
- Does not work with
@safefunctions. - Ignores C-style / D-style variadic arguments.
Example
static int inc(ref uint num) {
num++;
return 8675309;
}
uint myNum = 0;
auto incMyNumDel = toDelegate(&inc);
auto returnVal = incMyNumDel(myNum);
writeln(myNum); // 1
Authors
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.