stub constraint-based packer for canvas

libs/canvas/kiwi/variable.h

@@ -0,0 +1,111 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) 2013-2017, Nucleic Development Team.
+|
+| Distributed under the terms of the Modified BSD License.
+|
+| The full license is in the file LICENSE, distributed with this software.
+|----------------------------------------------------------------------------*/
+#pragma once
+#include <memory>
+#include <string>
+#include "shareddata.h"
+
+namespace kiwi
+{
+
+class Variable
+{
+
+public:
+    class Context
+    {
+    public:
+        Context() {}
+        virtual ~Context() {} // LCOV_EXCL_LINE
+    };
+
+    Variable(Context *context = 0) : m_data(new VariableData("", context)) {}
+
+    Variable(const std::string &name, Context *context = 0) : m_data(new VariableData(name, context)) {}
+
+    Variable(const char *name, Context *context = 0) : m_data(new VariableData(name, context)) {}
+
+    ~Variable() {}
+
+    const std::string &name() const
+    {
+        return m_data->m_name;
+    }
+
+    void setName(const char *name)
+    {
+        m_data->m_name = name;
+    }
+
+    void setName(const std::string &name)
+    {
+        m_data->m_name = name;
+    }
+
+    Context *context() const
+    {
+        return m_data->m_context.get();
+    }
+
+    void setContext(Context *context)
+    {
+        m_data->m_context.reset(context);
+    }
+
+    double value() const
+    {
+        return m_data->m_value;
+    }
+
+    void setValue(double value)
+    {
+        m_data->m_value = value;
+    }
+
+    // operator== is used for symbolics
+    bool equals(const Variable &other)
+    {
+        return m_data == other.m_data;
+    }
+
+private:
+    class VariableData : public SharedData
+    {
+
+    public:
+        VariableData(const std::string &name, Context *context) : SharedData(),
+                                                                  m_name(name),
+                                                                  m_context(context),
+                                                                  m_value(0.0) {}
+
+        VariableData(const char *name, Context *context) : SharedData(),
+                                                           m_name(name),
+                                                           m_context(context),
+                                                           m_value(0.0) {}
+
+        ~VariableData() {}
+
+        std::string m_name;
+        std::unique_ptr<Context> m_context;
+        double m_value;
+
+    private:
+        VariableData(const VariableData &other);
+
+        VariableData &operator=(const VariableData &other);
+    };
+
+    SharedDataPtr<VariableData> m_data;
+
+    friend bool operator<(const Variable &lhs, const Variable &rhs)
+    {
+        return lhs.m_data < rhs.m_data;
+    }
+};
+
+} // namespace kiwi