xy.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2024 the Initial Developer.
 *  All Rights Reserved.
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 *
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 *  GNU General Public License Version 2 or later (the GPL), in which case the 
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 *  deleting the provisions above and replace them with the notice and other 
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 *  *** END LICENSE INFORMATION ***
 */
 
 
 
/** @class lass::prim::XY
 *  @brief cyclic iterator over xy indices
 *  @author Bram de Greve [BdG]
 */
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_XY_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_XY_H
 
#include "prim_common.h"
#include "../num/modulo.h"
 
namespace lass
{
namespace prim
{
 
class XY
{
public:
 
    static constexpr size_t dimension = 2;
 
    /** intializes iterator to @a x axis.
     */
    constexpr XY(): value_(0) {}
 
    /** initializes iterator to an axis by character: 'x' or 'y'.
     */
    constexpr XY(char axis)
    {
        switch (axis)
        {
        case 0:
        case 'x':
        case 'X':
            value_ = 0;
            break;
 
        case 1:
        case 'y':
        case 'Y':
            value_ = 1;
            break;
 
        default:
            throw util::Exception("Invalid parameter axis.  Try 'x', 'X', 'y' or 'Y'.", LASS_PRETTY_FUNCTION);
        }
    }
 
    /** initializes iterator to an axis by number.
     *  ..., -1 == @a y, 0 == @a x, 1 == @a y, 2 == @a x, ...
    */
    explicit constexpr XY(int value): value_(value) {}
 
    /** initializes iterator to an axis by character: "x" or "y".
     */
    explicit XY(const std::string& axis)
    {
        if (axis.length() != 1)
        {
            LASS_THROW("Invalid parameter axis '" << axis << "'.  It must be a single character.");
        }
        *this = XY(axis[0]);
    }
 
    constexpr XY(const XY& other) = default;
    constexpr XY& operator=(const XY& other) = default;
 
    /** return axis by character: 'x' or 'y'.
     */
    constexpr char axis() const
    {
        LASS_ASSERT(value_ >= 0 && value_ < static_cast<int>(dimension));
        constexpr char axes[] = { 'x', 'y' };
        return axes[value_];
    }
 
    constexpr operator int() const { return value_; } /**< convert axis to integer. 0 == @a x, 1 == @a y */
    constexpr operator size_t() const { return static_cast<size_t>(value_); } /**< convert axis to integer. 0 == @a x, 1 == @a y */
 
    constexpr XY& operator++()
    {
        ++value_;
        return *this;
    }
    constexpr XY& operator--()
    {
        --value_;
        return *this;
    }
 
    constexpr XY operator++(int)
    {
        const XY result(*this);
        ++*this;
        return result;
    }
    constexpr XY operator--(int)
    {
        const XY result(*this);
        --*this;
        return result;
    }
 
    constexpr XY& operator+=(int offset)
    {
        value_ += offset;
        return *this;
    }
    constexpr XY& operator-=(int offset)
    {
        value_ -= offset;
        return *this;
    }
 
    constexpr XY operator+(int offset) const
    {
        return XY(value_ + offset);
    }
    constexpr XY operator-(int offset) const
    {
        return XY(value_ - offset);
    }
 
    constexpr bool operator==(XY other) const
    {
        return value_ == other.value_;
    }
    constexpr bool operator==(int other) const
    {
        return static_cast<int>(value_) == other;
    }
    constexpr bool operator==(size_t other) const
    {
        return static_cast<size_t>(value_) == other;
    }
    constexpr bool operator==(char other) const
    {
        return *this == XY(other);
    }
    bool operator==(const std::string& other) const
    {
        return *this == XY(other);
    }
 
    constexpr bool operator!=(XY other) const
    {
        return value_ != other.value_;
    }
    constexpr bool operator!=(int other) const
    {
        return static_cast<int>(value_) != other;
    }
    constexpr bool operator!=(size_t other) const
    {
        return static_cast<size_t>(value_) != other;
    }
    constexpr bool operator!=(char other) const
    {
        return *this != XY(other);
    }
    bool operator!=(const std::string& other) const
    {
        return *this != XY(other);
    }
 
private:
 
    typedef num::Modulo<dimension, int> TValue;
 
    TValue value_;
};
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator==(int a, const XY& b)
{
    return b == a;
}
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator==(size_t a, const XY& b)
{
    return b == a;
}
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator==(char a, const XY& b)
{
    return b == a;
}
 
/** @relates lass::prim::XY
 */
inline bool operator==(const std::string& a, const XY& b)
{
    return b == a;
}
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator!=(int a, const XY& b)
{
    return b != a;
}
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator!=(size_t a, const XY& b)
{
    return b != a;
}
 
/** @relates lass::prim::XY
 */
inline constexpr bool operator!=(char a, const XY& b)
{
    return b != a;
}
 
/** @relates lass::prim::XY
 */
inline bool operator!=(const std::string&  a, const XY& b)
{
    return b != a;
}
 
/** @relates lass::prim::XY
 */
template <typename Char, typename Traits>
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& stream, const XY& xy)
{
    stream << xy.axis();
    return stream;
}
 
 
 
}
 
}
 
#define LASS_PRIM_HAVE_PY_EXPORT_TRAITS_XY
#ifdef LASS_GUARDIAN_OF_INCLUSION_UTIL_PYOBJECT_PLUS_H
#   include "../python/export_traits_prim.h"
#endif
 
#endif
 
// EOF