qBound

  1. template <typename T>const T &qBound(const T &min, const T &val, const T &max)

Returns val bounded by min and max. This is equivalent to qMax(min, qMin(val, max)). 先比较val 和 max选出最小的值，然后以这个最小的值和min相比，选出最大的值。

  1. int myValue = 10;
  2. int minValue = 2;
  3. int maxValue = 6;
  5. int boundedValue = qBound(minValue, myValue, maxValue);
  6. // boundedValue == 6