sparse_vector_policies.h

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#ifndef TIL_SPARSE_VECTOR_POLICIES_H
#define TIL_SPARSE_VECTOR_POLICIES_H


#include "til/miscTools.h"

namespace til { namespace policy
{

  template < typename T >
  struct SVBaseline_DefaultValue
  {
    struct Exception : public std::runtime_error
    { Exception(const std::string & msg) : std::runtime_error(msg) {} };

    T operator()(std::size_t) const { return T(); }

    void setValue(const T & value)
    {
      if (value != T())
      {
        std::cerr << "Can't change baseline value to " << value << std::endl;
        throw Exception("Can't change baseline value");
      }
    }
  };


  template < typename T >
  struct SVBaseline_Value
  {
    struct Exception : public std::runtime_error
    { Exception(const std::string & msg) : std::runtime_error(msg) {} };

    
    SVBaseline_Value() : m_value() {}
    explicit SVBaseline_Value(const T & value) : m_value(value) {}

    T operator()(std::size_t) const { return m_value; }

    void setValue(const T & value)
    {
      m_value = value;
    }
    
    T m_value;
  };


}} // namespace til::policy

#endif