如果某个值发生浮点溢出，我想将其设置为零，就像这样...
m_speed += val;
if ( m_speed > numeric_limits<float>::max()) { // This might not even work, since some impls will wraparound after previous line
m_speed = 0.f
}
但一旦val添加m_speed，就已经发生了溢出（并且我假设如果这样做，也会发生相同的问题if (( m_speed + val ) > ..)。）
如何检查以确保不会发生溢出而发生溢出？