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OpenCV/include/opencv2/flann/any.h

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+#ifndef OPENCV_FLANN_ANY_H_
+#define OPENCV_FLANN_ANY_H_
+/*
+ * (C) Copyright Christopher Diggins 2005-2011
+ * (C) Copyright Pablo Aguilar 2005
+ * (C) Copyright Kevlin Henney 2001
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt
+ *
+ * Adapted for FLANN by Marius Muja
+ */
+
+//! @cond IGNORED
+
+#include "defines.h"
+#include <stdexcept>
+#include <ostream>
+#include <typeinfo>
+
+namespace cvflann
+{
+
+namespace anyimpl
+{
+
+struct bad_any_cast
+{
+};
+
+struct empty_any
+{
+};
+
+inline std::ostream& operator <<(std::ostream& out, const empty_any&)
+{
+    out << "[empty_any]";
+    return out;
+}
+
+struct base_any_policy
+{
+    virtual void static_delete(void** x) = 0;
+    virtual void copy_from_value(void const* src, void** dest) = 0;
+    virtual void clone(void* const* src, void** dest) = 0;
+    virtual void move(void* const* src, void** dest) = 0;
+    virtual void* get_value(void** src) = 0;
+    virtual const void* get_value(void* const * src) = 0;
+    virtual ::size_t get_size() = 0;
+    virtual const std::type_info& type() = 0;
+    virtual void print(std::ostream& out, void* const* src) = 0;
+    virtual ~base_any_policy() {}
+};
+
+template<typename T>
+struct typed_base_any_policy : base_any_policy
+{
+    virtual ::size_t get_size() CV_OVERRIDE { return sizeof(T); }
+    virtual const std::type_info& type() CV_OVERRIDE { return typeid(T); }
+
+};
+
+template<typename T>
+struct small_any_policy CV_FINAL : typed_base_any_policy<T>
+{
+    virtual void static_delete(void**) CV_OVERRIDE { }
+    virtual void copy_from_value(void const* src, void** dest) CV_OVERRIDE
+    {
+        new (dest) T(* reinterpret_cast<T const*>(src));
+    }
+    virtual void clone(void* const* src, void** dest) CV_OVERRIDE { *dest = *src; }
+    virtual void move(void* const* src, void** dest) CV_OVERRIDE { *dest = *src; }
+    virtual void* get_value(void** src) CV_OVERRIDE { return reinterpret_cast<void*>(src); }
+    virtual const void* get_value(void* const * src) CV_OVERRIDE { return reinterpret_cast<const void*>(src); }
+    virtual void print(std::ostream& out, void* const* src) CV_OVERRIDE { out << *reinterpret_cast<T const*>(src); }
+};
+
+template<typename T>
+struct big_any_policy CV_FINAL : typed_base_any_policy<T>
+{
+    virtual void static_delete(void** x) CV_OVERRIDE
+    {
+        if (* x) delete (* reinterpret_cast<T**>(x));
+        *x = NULL;
+    }
+    virtual void copy_from_value(void const* src, void** dest) CV_OVERRIDE
+    {
+        *dest = new T(*reinterpret_cast<T const*>(src));
+    }
+    virtual void clone(void* const* src, void** dest) CV_OVERRIDE
+    {
+        *dest = new T(**reinterpret_cast<T* const*>(src));
+    }
+    virtual void move(void* const* src, void** dest) CV_OVERRIDE
+    {
+        (*reinterpret_cast<T**>(dest))->~T();
+        **reinterpret_cast<T**>(dest) = **reinterpret_cast<T* const*>(src);
+    }
+    virtual void* get_value(void** src) CV_OVERRIDE { return *src; }
+    virtual const void* get_value(void* const * src) CV_OVERRIDE { return *src; }
+    virtual void print(std::ostream& out, void* const* src) CV_OVERRIDE { out << *reinterpret_cast<T const*>(*src); }
+};
+
+template<> inline void big_any_policy<flann_centers_init_t>::print(std::ostream& out, void* const* src)
+{
+    out << int(*reinterpret_cast<flann_centers_init_t const*>(*src));
+}
+
+template<> inline void big_any_policy<flann_algorithm_t>::print(std::ostream& out, void* const* src)
+{
+    out << int(*reinterpret_cast<flann_algorithm_t const*>(*src));
+}
+
+template<> inline void big_any_policy<cv::String>::print(std::ostream& out, void* const* src)
+{
+    out << (*reinterpret_cast<cv::String const*>(*src)).c_str();
+}
+
+template<typename T>
+struct choose_policy
+{
+    typedef big_any_policy<T> type;
+};
+
+template<typename T>
+struct choose_policy<T*>
+{
+    typedef small_any_policy<T*> type;
+};
+
+struct any;
+
+/// Choosing the policy for an any type is illegal, but should never happen.
+/// This is designed to throw a compiler error.
+template<>
+struct choose_policy<any>
+{
+    typedef void type;
+};
+
+/// Specializations for small types.
+#define SMALL_POLICY(TYPE) \
+    template<> \
+    struct choose_policy<TYPE> { typedef small_any_policy<TYPE> type; \
+    }
+
+SMALL_POLICY(signed char);
+SMALL_POLICY(unsigned char);
+SMALL_POLICY(signed short);
+SMALL_POLICY(unsigned short);
+SMALL_POLICY(signed int);
+SMALL_POLICY(unsigned int);
+SMALL_POLICY(signed long);
+SMALL_POLICY(unsigned long);
+SMALL_POLICY(float);
+SMALL_POLICY(bool);
+
+#undef SMALL_POLICY
+
+template <typename T>
+class SinglePolicy
+{
+    SinglePolicy();
+    SinglePolicy(const SinglePolicy& other);
+    SinglePolicy& operator=(const SinglePolicy& other);
+
+public:
+    static base_any_policy* get_policy();
+};
+
+/// This function will return a different policy for each type.
+template <typename T>
+inline base_any_policy* SinglePolicy<T>::get_policy()
+{
+    static typename choose_policy<T>::type policy;
+    return &policy;
+}
+
+} // namespace anyimpl
+
+struct any
+{
+private:
+    // fields
+    anyimpl::base_any_policy* policy;
+    void* object;
+
+public:
+    /// Initializing constructor.
+    template <typename T>
+    any(const T& x)
+        : policy(anyimpl::SinglePolicy<anyimpl::empty_any>::get_policy()), object(NULL)
+    {
+        assign(x);
+    }
+
+    /// Empty constructor.
+    any()
+        : policy(anyimpl::SinglePolicy<anyimpl::empty_any>::get_policy()), object(NULL)
+    { }
+
+    /// Special initializing constructor for string literals.
+    any(const char* x)
+        : policy(anyimpl::SinglePolicy<anyimpl::empty_any>::get_policy()), object(NULL)
+    {
+        assign(x);
+    }
+
+    /// Copy constructor.
+    any(const any& x)
+        : policy(anyimpl::SinglePolicy<anyimpl::empty_any>::get_policy()), object(NULL)
+    {
+        assign(x);
+    }
+
+    /// Destructor.
+    ~any()
+    {
+        policy->static_delete(&object);
+    }
+
+    /// Assignment function from another any.
+    any& assign(const any& x)
+    {
+        reset();
+        policy = x.policy;
+        policy->clone(&x.object, &object);
+        return *this;
+    }
+
+    /// Assignment function.
+    template <typename T>
+    any& assign(const T& x)
+    {
+        reset();
+        policy = anyimpl::SinglePolicy<T>::get_policy();
+        policy->copy_from_value(&x, &object);
+        return *this;
+    }
+
+    /// Assignment operator.
+    template<typename T>
+    any& operator=(const T& x)
+    {
+        return assign(x);
+    }
+
+    /// Assignment operator. Template-based version above doesn't work as expected. We need regular assignment operator here.
+    any& operator=(const any& x)
+    {
+        return assign(x);
+    }
+
+    /// Assignment operator, specialed for literal strings.
+    /// They have types like const char [6] which don't work as expected.
+    any& operator=(const char* x)
+    {
+        return assign(x);
+    }
+
+    /// Utility functions
+    any& swap(any& x)
+    {
+        std::swap(policy, x.policy);
+        std::swap(object, x.object);
+        return *this;
+    }
+
+    /// Cast operator. You can only cast to the original type.
+    template<typename T>
+    T& cast()
+    {
+        if (policy->type() != typeid(T)) throw anyimpl::bad_any_cast();
+        T* r = reinterpret_cast<T*>(policy->get_value(&object));
+        return *r;
+    }
+
+    /// Cast operator. You can only cast to the original type.
+    template<typename T>
+    const T& cast() const
+    {
+        if (policy->type() != typeid(T)) throw anyimpl::bad_any_cast();
+        const T* r = reinterpret_cast<const T*>(policy->get_value(&object));
+        return *r;
+    }
+
+    /// Returns true if the any contains no value.
+    bool empty() const
+    {
+        return policy->type() == typeid(anyimpl::empty_any);
+    }
+
+    /// Frees any allocated memory, and sets the value to NULL.
+    void reset()
+    {
+        policy->static_delete(&object);
+        policy = anyimpl::SinglePolicy<anyimpl::empty_any>::get_policy();
+    }
+
+    /// Returns true if the two types are the same.
+    bool compatible(const any& x) const
+    {
+        return policy->type() == x.policy->type();
+    }
+
+    /// Returns if the type is compatible with the policy
+    template<typename T>
+    bool has_type()
+    {
+        return policy->type() == typeid(T);
+    }
+
+    const std::type_info& type() const
+    {
+        return policy->type();
+    }
+
+    friend std::ostream& operator <<(std::ostream& out, const any& any_val);
+};
+
+inline std::ostream& operator <<(std::ostream& out, const any& any_val)
+{
+    any_val.policy->print(out,&any_val.object);
+    return out;
+}
+
+}
+
+//! @endcond
+
+#endif // OPENCV_FLANN_ANY_H_