On Friday, 21 February 2014 at 13:38:58 UTC, Gopan wrote:
Attempting to learn CTFE, I tried the following test.
size_t counter;
uint Test()
{
if (!__ctfe)
{
++counter;// This code is for execution at run time
}
return 2;
}
void main()
{
writeln("counter = ", counter);
immutable int n = Test();
int[n] arr;
writeln("arrary length = ", arr.length, " ; counter = ",
counter);
}
output:
counter = 0
arrary length = 2 ; counter = 1
For array declaration to be successful, its size has to be
known at compile time. The above code compiles too. But
__ctfe seems to be false while performing Test().
Instead, if I write
int[Test()] c;
writeln("c.length = ", c.length, " ; counter = ", counter);
output is
counter = 0
c.length = 2 ; counter = 0
What is wrong in my mind?
Thanks,
Gopan
Use enum n = Test() or make immutable n global variable i.e.
place it before main.