Problem collecting exception from a passed function

Gary Willoughby dev at nomad.so
Tue Nov 26 13:04:30 PST 2013


Figured it out. When using lazy don't pass as a pointer and call 
at the caller site. The argument is then lazily evaluated by the 
called function and not by the caller. This enables passing 
parameters at the caller site too.

import std.exception;
import std.stdio;

public void foo(A : Exception, B)(lazy B func)
{
	auto exception = collectException(func());
	writefln("%s", exception.msg);
}

void bar()
{
	throw new Exception("This is thrown");
}

void main(string[] args)
{
	foo!(Exception)(bar());
}


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