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Enum member std.range.isTwoWayCompatible

Returns true if fn accepts variables of type T1 and T2 in any order. The following code should compile:

enum isTwoWayCompatible(alias fn, T1, T2) = is(typeof((ref T1 a, ref T2 b) { cast(void)fn(a, b); cast(void)fn(b, a); } ));
(ref T1 a, ref T2 b)
  fn(a, b);
  fn(b, a);


void func1(int a, int b);
void func2(int a, float b);

static assert(isTwoWayCompatible!(func1, int, int));
static assert(isTwoWayCompatible!(func1, short, int));
static assert(!isTwoWayCompatible!(func2, int, float));

void func3(ref int a, ref int b);
static assert( isTwoWayCompatible!(func3, int, int));
static assert(!isTwoWayCompatible!(func3, short, int));


Andrei Alexandrescu, David Simcha, Jonathan M Davis, and Jack Stouffer. Credit for some of the ideas in building this module goes to Leonardo Maffi.


Boost License 1.0.