C++ Exceptions Question

I created the following code segment which recreates an interesting problem
with C++ exceptions. I am using Visual Studio C++ 6.0 Enterprise Edition.
When the program runs in DEBUG mode the exception is caught in the F2
function handler as I would expect. However when the program runs in
RELEASE mode the exeption is caught in the F1 function handler. The command
that is throwing the exception is the strcspn(). Why does this occur?

//-----------------------------------------------------------------
#include <iostream.h>
#include <string.h>

class EClass
{
public:
void F1(const char* a);
void F2(const char* b);
};

void EClass::F1(const char* a)
{
try
{
F2(a);
}
catch(...)
{
cout << "caught in F1 handler" << endl;
}
}

void EClass::F2(const char* a)
{
int i;
char* b = NULL;

try
{
b = strstr(a, "Test");
i = strcspn(b, "\r\n");
}
catch(...)
{
cout << "caught in F2 handler" << endl;
}
}

int main(int argc, char* argv[])
{
EClass ec;
char a[200];
strcpy(a,"Tes\r\n");

try
{
ec.F1(a);
}
catch(...)
{
cout << "caught in main handler" << endl;
}
return 0;
}
//-----------------------------------------------------------------

Tom


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Because you didn't specify Asynchronous exceptions using /EHa if you don't
the compiler assumes that exceptions are only thrown on function calls or on
throw statements but not on individual instructions.

BTW: This has nothing to do with networking.
Follow up is set to the vc.language group.

--
Steve Maillet (eMVP)
Entelechy Consulting
smaillet_AT_EntelechyConsulting_DOT_com