gcc/testsuite/gdc.test/compilable/test23651.d

   1 // https://issues.dlang.org/show_bug.cgi?id=23651
   2
   3 template isCallable(alias callable)
   4 {
   5     static if (is(typeof(&callable!())))
   6         enum bool isCallable = isCallable!(typeof(&callable!()));
   7     else
   8         enum bool isCallable = true;
   9 }
  10
  11 string foo();
  12
  13 template FunctionTypeOf(alias func)
  14 if (isCallable!func)
  15 {
  16     alias FunctionTypeOf = typeof(foo);
  17 }
  18
  19 template ReturnType(alias func)
  20 {
  21     static if (is(FunctionTypeOf!func R == return))
  22         alias ReturnType = R;
  23 }
  24
  25 template isAttrRange()
  26 {
  27     alias NameType  = ReturnType!((string r) => r);
  28     //pragma(msg, "isAttrRange ", NameType, " ", string);
  29     static assert(is(NameType == string));
  30
  31     enum isAttrRange = is(NameType == string);
  32 }
  33
  34 static assert(isAttrRange!());