operators.h

// Description: Operators as functions

#ifndef PASTELSYS_OPERATORS_H
#define PASTELSYS_OPERATORS_H

#define PASTEL_UNARY_OPERATOR(NAME, OP) \
   class NAME \
   { \
   public: \
       template <typename Type> \
       decltype(auto) operator()( \
           const Type& that) const \
       { \
           return OP that; \
       } \
   };

#define PASTEL_BINARY_OPERATOR(NAME, OP) \
   class NAME \
   { \
   public: \
       template < \
           typename Left, \
           typename Right> \
       decltype(auto) operator()( \
           const Left& left,  \
           const Right& right) const \
       { \
           return left OP right; \
       } \
   };

#ifdef _MSC_VER
    // Visual Studio 2015 Update 1 has a bug which gives
    // a spurious warning here.
    #pragma warning(push)
    #pragma warning(disable: 4552)
    #pragma warning(disable: 4553)
#endif

namespace Pastel
{

    PASTEL_UNARY_OPERATOR(Minus, -);
    PASTEL_UNARY_OPERATOR(Plus, +);
    PASTEL_UNARY_OPERATOR(LogicalNot, !);
    PASTEL_UNARY_OPERATOR(BitNot, ~);
    PASTEL_UNARY_OPERATOR(Dereference, *);

    PASTEL_BINARY_OPERATOR(EqualTo, ==);
    PASTEL_BINARY_OPERATOR(NotEqualTo, !=);
    PASTEL_BINARY_OPERATOR(LessThan, <);
    PASTEL_BINARY_OPERATOR(LessEqual, <=);
    PASTEL_BINARY_OPERATOR(GreaterThan, >);
    PASTEL_BINARY_OPERATOR(GreaterEqual, >=);
    PASTEL_BINARY_OPERATOR(Multiplication, *);
    PASTEL_BINARY_OPERATOR(Division, /);
    PASTEL_BINARY_OPERATOR(Quotient, %);
    PASTEL_BINARY_OPERATOR(Addition, +);
    PASTEL_BINARY_OPERATOR(Subtraction, -);
    PASTEL_BINARY_OPERATOR(LeftShift, <<);
    PASTEL_BINARY_OPERATOR(RightShift, >>);
    PASTEL_BINARY_OPERATOR(LogicalAnd, &&);
    PASTEL_BINARY_OPERATOR(LogicalOr, ||);
    PASTEL_BINARY_OPERATOR(BitXor, ^);
    PASTEL_BINARY_OPERATOR(BitAnd, &);
    PASTEL_BINARY_OPERATOR(BitOr, |);

}

#ifdef _MSC_VER
    #pragma warning(pop)
#endif

#endif