feat(mo): add moRealVectorNeighbor for continuous local search

mo/src/neighborhood/moRealVectorNeighbor.h

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+/*
+ <moRealVectorNeighbor.h>
+ Copyright (C) Eremey Valetov, 2026
+
+ This software is governed by the CeCILL license under French law and
+ abiding by the rules of distribution of free software.  You can  use,
+ modify and/ or redistribute the software under the terms of the CeCILL
+ license as circulated by CEA, CNRS and INRIA at the following URL
+ "http://www.cecill.info".
+
+ As a counterpart to the access to the source code and  rights to copy,
+ modify and redistribute granted by the license, users are provided only
+ with a limited warranty  and the software's author,  the holder of the
+ economic rights,  and the successive licensors  have only  limited liability.
+
+ In this respect, the user's attention is drawn to the risks associated
+ with loading,  using,  modifying and/or developing or reproducing the
+ software by the user in light of its specific status of free software,
+ that may mean  that it is complicated to manipulate,  and  that  also
+ therefore means  that it is reserved for developers  and  experienced
+ professionals having in-depth computer knowledge. Users are therefore
+ encouraged to load and test the software's suitability as regards their
+ requirements in conditions enabling the security of their systems and/or
+ data to be ensured and,  more generally, to use and operate it in the
+ same conditions as regards security.
+ The fact that you are presently reading this means that you have had
+ knowledge of the CeCILL license and that you accept its terms.
+
+ ParadisEO WebSite : https://nojhan.github.io/paradiseo/
+ Contact: https://github.com/nojhan/paradiseo/issues
+*/
+
+#ifndef _moRealVectorNeighbor_h
+#define _moRealVectorNeighbor_h
+
+#include <EO.h>
+#include <neighborhood/moBackableNeighbor.h>
+#include <vector>
+#include <iterator>
+#include <ostream>
+
+/**
+ * Neighbor for real-valued vector solutions.
+ *
+ * Stores a delta vector; move() adds it to the solution, moveBack() subtracts it.
+ */
+template<class EOT, class Fitness = typename EOT::Fitness>
+class moRealVectorNeighbor : public moBackableNeighbor<EOT, Fitness>, public std::vector<double> {
+public:
+    typedef std::vector<double> EOVT;
+    using EOVT::operator[];
+    using EOVT::size;
+
+    moRealVectorNeighbor(unsigned _size = 0, double _value = 0.0)
+        : moBackableNeighbor<EOT, Fitness>(), EOVT(_size, _value) {}
+
+    moRealVectorNeighbor(const moRealVectorNeighbor& _n)
+        : moBackableNeighbor<EOT, Fitness>(_n), EOVT(_n) {}
+
+    moRealVectorNeighbor& operator=(const moRealVectorNeighbor& _source) {
+        moBackableNeighbor<EOT, Fitness>::operator=(_source);
+        EOVT::operator=(_source);
+        return *this;
+    }
+
+    bool equals(moRealVectorNeighbor& _neighbor) const {
+        if (size() != _neighbor.size())
+            return false;
+        for (size_t i = 0; i < size(); i++)
+            if ((*this)[i] != _neighbor[i])
+                return false;
+        return true;
+    }
+
+    void move(EOT& _solution) override {
+        for (size_t i = 0; i < _solution.size(); i++)
+            _solution[i] += (*this)[i];
+        _solution.invalidate();
+    }
+
+    void moveBack(EOT& _solution) override {
+        for (size_t i = 0; i < _solution.size(); i++)
+            _solution[i] -= (*this)[i];
+        _solution.invalidate();
+    }
+
+    void printOn(std::ostream& _os) const override {
+        EO<Fitness>::printOn(_os);
+        _os << ' ' << size() << ' ';
+        std::copy(this->begin(), this->end(), std::ostream_iterator<double>(_os, " "));
+    }
+
+    std::string className() const override {
+        return "moRealVectorNeighbor";
+    }
+};
+
+#endif