Visual C++: numeric_limits<char> min/max incorrect when using /J

Visual C++: numeric_limits<char> min/max incorrect when using /J by bjehlert

Closed

as Fixed

Type:	Bug
ID:	548693
Opened:	4/4/2010 10:49:59 PM
Access Restriction:	Public

Workaround(s)

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User(s) can reproduce this bug

When compiling with /J, numeric_limits<char> should return the same values as numeric_limits<unsigned char>, but does not. Instead, the following values are given:

min: 128 (expected: 0)
max: 127 (expected: 255)

Details (expand)

English

Visual Studio 2010 Release Candidate

Windows 7

English

Compile the following program using /J

#include <iostream>
#include <limits>

int main(void)
{
    std::cout << "numeric_limits<char>::min(): " << (int)std::numeric_limits<char>::min() << std::endl;
    std::cout << "numeric_limits<char>::max(): " << (int)std::numeric_limits<char>::max() << std::endl;

    return 0;
}

Prints the following:

numeric_limits<char>::min(): 128
numeric_limits<char>::max(): 127

numeric_limits<char>::min(): 0
numeric_limits<char>::max(): 255

0 attachments

Posted by Microsoft on 6/22/2010 at 1:49 PM

Hi,

Thanks for reporting this bug. We've fixed it, and the fix will be available in VC11. The fix was to make numeric_limits header-only, which has the side effect of increasing performance.

If you have any further questions, feel free to E-mail me at stl@microsoft.com .

Stephan T. Lavavej
Visual C++ Libraries Developer

Posted by Microsoft on 4/6/2010 at 12:20 AM

We were able to reproduce the issue you are seeing. We are routing this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.

Posted by Microsoft on 4/5/2010 at 4:03 AM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)