SgEBWArray.h

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//----------------------------------------------------------------------------
/** @file SgEBWArray.h
    Arrays indexed by color. */
//----------------------------------------------------------------------------

#ifndef SG_EBWARRAY_H
#define SG_EBWARRAY_H

#include "SgBoardColor.h"

//----------------------------------------------------------------------------

/** An array of three values of type T, indexed by SG_EMPTY, SG_BLACK and
    SG_WHITE.
    Stores index SG_EMPTY (=4) at array[0]. */
template <class T>
class SgEBWArray
{
public:
    /** Constructor.
        Constructs elements with the default constructor of type T.
        @note Previously, EBWArray automatically initialized primitive types
        like ints or pointers with 0, and there was a second class
        EBWConstrArray used for non-primitive types. This has changed,
        because it is not the standard semantics for container classes in C++,
        and because it does not allow use cases with incremental
        initialization after construction. If you want to initialize for
        example an SgBWArray<int> with 0, use the constructor that takes a
        default value. */
    SgEBWArray()
    {
    }

    SgEBWArray(const T& val)
    {
        m_array[SG_BLACK] = val;
        m_array[SG_WHITE] = val;
        m_array[SG_EMPTY] = val;
    }

    SgEBWArray(const T& empty, const T& black, const T& white)
    {
        m_array[SG_BLACK] = black;
        m_array[SG_WHITE] = white;
        m_array[SG_EMPTY] = empty;
    }

    const T& operator[](SgEmptyBlackWhite c) const
    {
        SG_ASSERT_EBW(c);
        return m_array[c];
    }

    T& operator[](SgEmptyBlackWhite c)
    {
        SG_ASSERT_EBW(c);
        return m_array[c];
    }

private:
    T m_array[3];
};

//----------------------------------------------------------------------------

#endif // SG_EBWARRAY_H