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Enum member `std.traits.extractParameterStorageClassFlags`

Convert the result of __traits(getParameterStorageClasses) to ParameterStorageClass enums.


						
				enum extractParameterStorageClassFlags(Attribs...)
				 = ()
{
auto result = ParameterStorageClass.none;
static if (Attribs.length > 0)
{
static foreach (attrib; Attribs)
{
final switch (attrib)
{
with (ParameterStorageClass)
{
case "scope":
{
result |= scope_;
break;
}
case "in":
{
result |= in_;
break;
}
case "out":
{
result |= out_;
break;
}
case "ref":
{
result |= ref_;
break;
}
case "lazy":
{
result |= lazy_;
break;
}
case "return":
{
result |= return_;
break;
}
}
}
}
if (result == (ParameterStorageClass.ref_ | ParameterStorageClass.return_))
result = ParameterStorageClass.return_;
}

return result;
}
();

Parameters

Name	Description
Attribs	The return value of `__traits(getParameterStorageClasses)`

Returns

The bitwise OR of the equivalent ParameterStorageClass enums.

Example

static void func(ref int ctx, out real result);

enum param1 = extractParameterStorageClassFlags!(
    __traits(getParameterStorageClasses, func, 0)
);
static assert(param1 == ParameterStorageClass.ref_);

enum param2 = extractParameterStorageClassFlags!(
    __traits(getParameterStorageClasses, func, 1)
);
static assert(param2 == ParameterStorageClass.out_);

enum param3 = extractParameterStorageClassFlags!(
    __traits(getParameterStorageClasses, func, 0),
    __traits(getParameterStorageClasses, func, 1)
);
static assert(param3 == (ParameterStorageClass.ref_ | ParameterStorageClass.out_));

Authors

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

License

Boost License 1.0.