class MyClass
{
   private:
     static const int intvalue= 50;
     static const float floatvalue = 0.07f;
 };

如上申请方式导致错误

error C2864: 'MyClass::floatvalue : only static const integral data members can be initialized within a class

1. 尝试使用 static constexpr float floatvalue = 0.5f;

error C4430: 缺少类型说明符 - 假定为 int。注意:  C++ 不支持默认 int	
error C2144: 语法错误:“float”的前面应有“;”	

2.  MyClass.h

class MyClass
{
   private:
     static const int intvalue = 50; // can provide a value here (integral constant)
     static const float floatvalue; // canNOT provide a value here (not integral)
};

MyClass.cpp

const int MyClass::intvalue; // no value (already provided in header)
const float MyClass::floatvalue = 0.07f; // value provided HERE

可以解决如上问题

 

博客参考 https://*.com/questions/17566575/how-to-initialize-a-static-const-float-in-a-c-class-in-visual-studio