Expression.h

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// This file is part of MyraMath, copyright (c) 2014-2019 by Ryan A Chilton  //
// and distributed by MyraCore, LLC. See LICENSE.txt for license terms.      //
// ========================================================================= //

#ifndef MYRAMATH_EXPRESSION_EXPRESSION_H
#define MYRAMATH_EXPRESSION_EXPRESSION_H

#include <myramath/MYRAMATH_EXPORT.h>
#include <myramath/utility/Number.h>

#include <myramath/expression/Index.h>

#ifdef MYRAMATH_ENABLE_CPP11
#include <initializer_list>
#endif

namespace myra {

// Forward declarations.
namespace detail { template<int Arity, class Number> class ExpressionBase; }

template<int Arity, class Number> class MYRAMATH_EXPORT Expression
  {
  public:

    // ------------------------------------ Value semantics.

    Expression();

    Expression(const detail::ExpressionBase<Arity,Number>& that);

    Expression(const Expression<Arity,Number>& that);

    void swap(Expression<Arity,Number>& that);

    Expression<Arity,Number>& operator= (Expression<Arity,Number> that);

   ~Expression(); 

    // ------------------------------------ Expression API.

    Index<Arity> size() const;
  
    Number evaluate(Index<Arity> i) const;

#ifdef MYRAMATH_ENABLE_CPP11

    Number evaluate(std::initializer_list<int> i) const;

#endif

  private:

    // Underlying polymorphic instance, an ExpressionBase.
    detail::ExpressionBase<Arity,Number>* base;
    
  };

} // namespace myra

#endif