可视C++速递:找不到 fmin 和 fmax 标识符

我已经在Mac上编译了这段代码，所以我知道没有语法错误，但是，在VC++ Express 2010中，我收到一个错误，说找不到fmin和fmax标识符。我安装了Windows SDK 7.1以查看是否可以修复它，但它什么也没做：/

#include "DigitalDistortion.h"
#include "IPlug_include_in_plug_src.h"
#include "IControl.h"
#include "resource.h"
const int kNumPrograms = 1;
enum EParams
{
  kThreshold = 0,
  kNumParams
};
enum ELayout
{
  kWidth = GUI_WIDTH,
  kHeight = GUI_HEIGHT,
  kThresholdX = 100,
  kThresholdY = 100,
  kKnobFrames = 60
};
DigitalDistortion::DigitalDistortion(IPlugInstanceInfo instanceInfo)
  :     IPLUG_CTOR(kNumParams, kNumPrograms, instanceInfo), mThreshold(1.)
{
  TRACE;
  //arguments are: name, defaultVal, minVal, maxVal, step, label
  GetParam(kThreshold)->InitDouble("Threshold", 100., 0.01, 100.0, 0.01, "%");
  GetParam(kThreshold)->SetShape(2.);
  IGraphics* pGraphics = MakeGraphics(this, kWidth, kHeight);
  pGraphics->AttachPanelBackground(&COLOR_RED);
  IBitmap knob = pGraphics->LoadIBitmap(KNOB_ID, KNOB_FN, kKnobFrames);
  pGraphics->AttachControl(new IKnobMultiControl(this, kThresholdX, kThresholdY,         kThreshold, &knob));
  AttachGraphics(pGraphics);
  //MakePreset("preset 1", ... );
  MakeDefaultPreset((char *) "-", kNumPrograms);
}
DigitalDistortion::~DigitalDistortion() {}
void DigitalDistortion::ProcessDoubleReplacing(
    double** inputs,
    double** outputs,
    int nFrames)
{
  // Mutex is already locked for us.
  int const channelCount = 2;
  for (int i = 0; i < channelCount; i++) {
    double* input = inputs[i];
    double* output = outputs[i];
    for (int s = 0; s < nFrames; ++s, ++input, ++output) {
      if(*input >= 0) {
        // Make sure positive values can't go above the threshold:
        *output = fmin(*input, mThreshold);
      } else {
        // Make sure negative values can't go below the threshold:
        *output = fmax(*input, -mThreshold);
      }
      *output /= mThreshold;
    }
  }
}
void DigitalDistortion::Reset()
{
  TRACE;
  IMutexLock lock(this);
}
void DigitalDistortion::OnParamChange(int paramIdx)
{
  IMutexLock lock(this);
  switch (paramIdx)
  {
    case kThreshold:
      mThreshold = GetParam(kThreshold)->Value() / 100.;
      break;
    default:
      break;
  }
}