c++ - Defining value traits for floating points -

while writing code in c++, want express notion component of type x, min value kminvalue , max value kmaxvalue. purpose, did like:

template <typename componenttype> struct comptraits {  };  template <> struct comptraits<unsigned char> {     typedef unsigned char componenttype;     enum{         kminvalue = 0,         kmaxvalue = 255     };               }; 

and, can refer comptraits<unsigned char>::kminvalue. but, not able understand trick floating data types. please in defining same thing floats.

thanks in advance.

you can use std::numeric_limits, instead of constants, if want kminvalue , kmaxvalue - can use this

c++03

template<> struct comptraits<float> {    static const float kminvalue;    static const float kmaxvalue; };  const float comptraits<float>::kminvalue = std::numeric_limits<float>::min(); const float comptraits<float>::kmaxvalue = std::numeric_limits<float>::max(); 

c++11

template<> struct comptraits<float> {    static constexpr float kminvalue = std::numeric_limits<float>::min();    static constexpr float kmaxvalue = std::numeric_limits<float>::max(); }; 

for case should use

template<> struct comptraits<float> {    static const float kminvalue = 0.0f;    static const float kmaxvalue = 1.0f; };