SetFunctionAttributes

Constructs a new function or delegate type with the same basic signature as the given one, but different attributes (including linkage).

This is especially useful for adding/removing attributes to/from types in generic code, where the actual type name cannot be spelt out.

template SetFunctionAttributes(T, string linkage, uint attrs)
template SetFunctionAttributes (
T
string linkage
uint attrs
) if (
isFunctionPointer!T ||
isDelegate!T
)
template SetFunctionAttributes(T, string linkage, uint attrs)

Parameters

T: The base type.
linkage: The desired linkage of the result type.
attrs: The desired FunctionAttributes of the result type.

Examples

1 alias ExternC(T) = SetFunctionAttributes!(T, "C", functionAttributes!T);
2 
3 auto assumePure(T)(T t)
4 if (isFunctionPointer!T || isDelegate!T)
5 {
6     enum attrs = functionAttributes!T | FunctionAttribute.pure_;
7     return cast(SetFunctionAttributes!(T, functionLinkage!T, attrs)) t;
8 }
9 
10 int f()
11 {
12     import core.thread : getpid;
13     return getpid();
14 }
15 
16 int g() pure @trusted
17 {
18     auto pureF = assumePure(&f);
19     return pureF();
20 }
21 assert(g() > 0);

SetFunctionAttributes

Parameters

Examples

Meta

Source