#include <eckit/value/Expression.h>
          template<class T>
          Expression class
        
        
Derived classes
- 
              template<class T>class ListExpression
- 
              template<class T>class NumberExpression
- 
              template<class T>class StringExpression
Constructors, destructors, conversion operators
- ~Expression() virtual
Public functions
- 
              auto eval(T&) const -> eckit::Value pure virtual 
Private functions
- 
              void print(std::ostream&) const pure virtual 
Friends
- 
              auto operator<<(std::ostream& s, const Expression<T>& c) -> std:: ostream&