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Alias std.traits.ParameterStorageClassTuple

Get a tuple of the storage classes of a function's parameters.

alias ParameterStorageClassTuple(alias func) = AliasSeq!();


func function symbol or type of function, delegate, or pointer to function


A tuple of ParameterStorageClass bits


alias STC = ParameterStorageClass; // shorten the enum name

void func(ref int ctx, out real result, in real param, void* ptr)
alias pstc = ParameterStorageClassTuple!func;
static assert(pstc.length == 4); // number of parameters
static assert(pstc[0] == STC.ref_);
static assert(pstc[1] == STC.out_);
version (none)
    // TODO: When the DMD PR (dlang/dmd#11474) gets merged,
    // remove the versioning and the second test
    static assert(pstc[2] == STC.in_);
    // This is the current behavior, before `in` is fixed to not be an alias
    static assert(pstc[2] == STC.scope_);
static assert(pstc[3] == STC.none);


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


Boost License 1.0.