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// Author: Ali Çehreli
// See https://forum.dlang.org/post/o2n7f8$2p1t$1@digitalmars.com
import core.stdc.stdio;
class TestException : Exception
{
this(string msg)
{
super(typeof(this).stringof~": "~msg);
}
}
class TestError : Error
{
this(string msg)
{
super(typeof(this).stringof~": "~msg);
}
}
// Causes an exception chain where the node at index errorIndex is an
// Error (others are all Exceptions).
void causeExceptionChain(size_t chainLength, size_t errorIndex)
{
void throws(size_t n)
{
scope (exit)
{
string msg = [ cast(char)('a'+n) ].idup;
if (n == errorIndex)
{
throw new TestError(msg);
}
else
{
throw new TestException(msg);
}
}
if (n != 0)
{
// Redundant 'return' keyword due to
// https://issues.dlang.org/show_bug.cgi?id=16960
return throws(n - 1);
}
}
throws(chainLength - 1);
}
void main()
{
try
{
// -1 would mean "no Error in the chain". Change this to a
// number between 0 and 4 (inclusive) then you will realize
// that the Exception below will not be caught.
size_t errorIndex = 3;
causeExceptionChain(5, errorIndex);
}
catch (Error original)
{
printf("Caught\n");
string prefix = "";
for ({ size_t i; Throwable ex = original; } ex; ex = ex.next, ++i)
{
printf("%.*s%.*s\n", cast(int)prefix.length, prefix.ptr, cast(int)ex.msg.length, ex.msg.ptr);
prefix = prefix~" ";
}
printf("Bypassed chain was:\n");
prefix = "";
for ({ size_t i; Throwable ex = original.bypassedException; } ex; ex = ex.next, ++i)
{
printf("%.*s%.*s\n", cast(int)prefix.length, prefix.ptr, cast(int)ex.msg.length, ex.msg.ptr);
prefix = prefix~" ";
}
}
}
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