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Template `std.traits.SetFunctionAttributes`

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


						
				template SetFunctionAttributes(T, string linkage, uint attrs)
				;
						
						
				alias SetFunctionAttributes(T, string linkage, uint attrs)
				 = FunctionTypeOf!(SetFunctionAttributes!(T*,linkage,attrs));

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

Alias SetFunctionAttributes

Parameters

Name	Description
T	The base type.
linkage	The desired linkage of the result type.
attrs	The desired `FunctionAttribute`s of the result type.

Example

alias ExternC(T) = SetFunctionAttributes!(T, "C", functionAttributes!T);

auto assumePure(T)(T t)
if (isFunctionPointer!T || isDelegate!T)
{
    enum attrs = functionAttributes!T | FunctionAttribute.pure_;
    return cast(SetFunctionAttributes!(T, functionLinkage!T, attrs)) t;
}

int f()
{
    import core.thread : getpid;
    return getpid();
}

int g() pure @trusted
{
    auto pureF = assumePure(&f);
    return pureF();
}
assert(g() > 0);

Authors

Walter Bright, Tomasz Stachowiak (isExpressions), Andrei Alexandrescu, Shin Fujishiro, Robert Clipsham, David Nadlinger, Kenji Hara, Shoichi Kato

License

Boost License 1.0.