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Template std.traits.isCallable
Detect whether T is a callable object, which can be called with the
function call operator (...).
Arguments
template isCallable(T...);
Example
interface I { real value() @property; }
struct S { static int opCall(int) { return 0; } }
class C { int opCall(int) { return 0; } }
auto c = new C;
static assert( isCallable!c);
static assert( isCallable!S);
static assert( isCallable!(c.opCall));
static assert( isCallable!(I.value));
static assert( isCallable!((int a) { return a; }));
static assert(!isCallable!I);
Authors
Walter Bright,
Tomasz Stachowiak (isExpressions