在stdint.h中找不到符号

Question

When I used Apportable for my C++ source code, It cannot find symbols defined in stdint.h .

error: use of undeclared identifier 'UINT8_MAX'

The code worked well with Xcode, and this error raised only on Apportable. I added #include <cstdint> , but it was no effect.

Here's my current .cpp file.

#include <cstdint>
#include "Pixel.h"

namespace
Eonil
{
    namespace
    Graphics
    {
        using namespace std;

        Pixel::Pixel(glm::vec4 const vector)
        {
            r   =   vector.r * ((Scalar)UINT8_MAX);
            g   =   vector.g * ((Scalar)UINT8_MAX);
            b   =   vector.b * ((Scalar)UINT8_MAX);
            a   =   vector.a * ((Scalar)UINT8_MAX);
        }

        glm::vec4 const
        Pixel::vector() const
        {
            return  glm::vec4(((Scalar)r) / ((Scalar)UINT8_MAX),
                              ((Scalar)g) / ((Scalar)UINT8_MAX),
                              ((Scalar)b) / ((Scalar)UINT8_MAX),
                              ((Scalar)a) / ((Scalar)UINT8_MAX));
        }
    }
}

What am I missing?

Answer 1

The macros are available when __STDC_LIMIT_MACROS is defined (additionally __STDC_CONSTANT_MACROS seems to be missing as well). This is probably incorrectly gated or missing when compiling c++. Objective-C and C pick up on these defines for UINT8_MAX and accompanying macros. For now you can define both of those macros globally and it should have no ill effects on your project.