Hello,
I’m having issues with wrapping of boost::time_duration derived types. I can’t find anywhere in the documentation for when the time_duration types are supposed to wrap around.
I have attached some sample source code below. The output is:
SecCount = 80000000 is OK.
Strange
Stranger
Problematic
SecCount = 80000001 is STRANGE.
I expect the output to be
SecCount = 80000000 is OK.
SecCount = 80000001 is OK.
The problem we ran into had to do with seconds and milliseconds having different maximum permissible values. Any idea why boost::posix_time::seconds goes negative at 0x80000001 while milliseconds is not until much later?
Thanks,
Justin
//
// test.cpp
//
#include
#include <iostream>
using namespace std;
using namespace boost::posix_time;
//-------------------------------------------------------
//-------------------------------------------------------
void Strange(long SecCount)
{
long MilliCount = 1000 * SecCount;
bool IsStrange = false;
if (SecCount >= 0 && seconds(SecCount).is_negative())
{
cout << "Strange" << endl;
IsStrange = true;
if (!milliseconds(MilliCount).is_negative())
{
// If seconds wraps, why doesn't milliseconds?
cout << "Stranger" << endl;
IsStrange = true;
}
}
if (seconds(SecCount) != milliseconds(MilliCount))
{
cout << "Problematic" << endl;
IsStrange = true;
}
if (!IsStrange)
{
cout << "SecCount = " << SecCount << " is OK." << endl;
}
else
{
cout << "SecCount = " << SecCount << " is STRANGE." << endl;
}
}
//-------------------------------------------------------
//-------------------------------------------------------
int main()
{
cout << hex;
Strange(0x80000000);
Strange(0x80000001);
return 0;
}
