Const initialization issue, looking for solution

[Ali Çehreli]

On 05/29/2013 06:25 AM, Jakob Ovrum wrote:

 > I was unable to leverage std.exception.

I have looked only your short example. std.exception.ifThrown may work:

import std.typecons;
import std.exception;

alias ToThrow = Flag!"ToThrow";

// Can throw, and we want to catch
int createTheVar(ToThrow toThrow)
{
     if (toThrow == ToThrow.yes) {
         throw new Exception("bad cat!");
     }

     return 42;
}

// Can also throw, but we don't want to catch it here
int transform(int a)
{
     return a + 1;
}

int foo(ToThrow toThrow)
{
     const(int) i = createTheVar(toThrow).ifThrown!Exception(666);
     return transform(i);
}

unittest
{
     assert(foo(ToThrow.yes) == 667);
     assert(foo(ToThrow.no) == 43);
}

void main()
{}

Ali