5#ifndef ALSON_CLASSIC_BASE_ENTITY_POINT_UV_H 
    6#define ALSON_CLASSIC_BASE_ENTITY_POINT_UV_H 
   28            : 
PointUV(std::nanf(
""), std::nanf(
"")) {}
 
 
   53    bool isNan()
 const { 
return std::isnan(
u) || std::isnan(
v); };
 
 
PointUV & operator=(const PointUV &)=default
 
PointUV(float _u, float _v)
 
PointUV(const PointUV &)=default
 
PointUV & operator=(PointUV &&)=default
 
PointUV(PointUV &&)=default