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#ifndef OPENCV_CORE_CVSTD_HPP
#define OPENCV_CORE_CVSTD_HPP

#ifndef __cplusplus
#  error cvstd.hpp header must be compiled as C++
#endif

#include "opencv2/core/cvdef.h"
#include <cstddef>
#include <cstring>
#include <cctype>

#include <string>

// import useful primitives from stl
#  include <algorithm>
#  include <utility>
#  include <cstdlib> //for abs(int)
#  include <cmath>

namespace cv
{
    static inline uchar abs(uchar a) { return a; }
    static inline ushort abs(ushort a) { return a; }
    static inline unsigned abs(unsigned a) { return a; }
    static inline uint64 abs(uint64 a) { return a; }

    using std::min;
    using std::max;
    using std::abs;
    using std::swap;
    using std::sqrt;
    using std::exp;
    using std::pow;
    using std::log;
}

#include "cvstd_wrapper.hpp"

namespace cv {

//! @addtogroup core_utils
//! @{

//////////////////////////// memory management functions ////////////////////////////

/** @brief Allocates an aligned memory buffer.

The function allocates the buffer of the specified size and returns it. When the buffer size is 16
bytes or more, the returned buffer is aligned to 16 bytes.
@param bufSize Allocated buffer size.
 */
CV_EXPORTS void* fastMalloc(size_t bufSize);

/** @brief Deallocates a memory buffer.

The function deallocates the buffer allocated with fastMalloc . If NULL pointer is passed, the
function does nothing. C version of the function clears the pointer *pptr* to avoid problems with
double memory deallocation.
@param ptr Pointer to the allocated buffer.
 */
CV_EXPORTS void fastFree(void* ptr);

/*!
  The STL-compilant memory Allocator based on cv::fastMalloc() and cv::fastFree()
*/
template<typename _Tp> class Allocator
{
public:
    typedef _Tp value_type;
    typedef value_type* pointer;
    typedef const value_type* const_pointer;
    typedef value_type& reference;
    typedef const value_type& const_reference;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    template<typename U> class rebind { typedef Allocator<U> other; };

    explicit Allocator() {}
    ~Allocator() {}
    explicit Allocator(Allocator const&) {}
    template<typename U>
    explicit Allocator(Allocator<U> const&) {}

    // address
    pointer address(reference r) { return &r; }
    const_pointer address(const_reference r) { return &r; }

    pointer allocate(size_type count, const void* =0) { return reinterpret_cast<pointer>(fastMalloc(count * sizeof (_Tp))); }
    void deallocate(pointer p, size_type) { fastFree(p); }

    void construct(pointer p, const _Tp& v) { new(static_cast<void*>(p)) _Tp(v); }
    void destroy(pointer p) { p->~_Tp(); }

    size_type max_size() const { return cv::max(static_cast<_Tp>(-1)/sizeof(_Tp), 1); }
};

//! @} core_utils

//! @endcond

//! @addtogroup core_basic
//! @{

//////////////////////////////// string class ////////////////////////////////

class CV_EXPORTS FileNode; //for string constructor from FileNode

typedef std::string String;

#ifndef OPENCV_DISABLE_STRING_LOWER_UPPER_CONVERSIONS

//! @cond IGNORED
namespace details {
// std::tolower is int->int
static inline char char_tolower(char ch)
{
    return (char)std::tolower((int)ch);
}
// std::toupper is int->int
static inline char char_toupper(char ch)
{
    return (char)std::toupper((int)ch);
}
} // namespace details
//! @endcond

static inline std::string toLowerCase(const std::string& str)
{
    std::string result(str);
    std::transform(result.begin(), result.end(), result.begin(), details::char_tolower);
    return result;
}

static inline std::string toUpperCase(const std::string& str)
{
    std::string result(str);
    std::transform(result.begin(), result.end(), result.begin(), details::char_toupper);
    return result;
}

#endif // OPENCV_DISABLE_STRING_LOWER_UPPER_CONVERSIONS

//! @} core_basic
} // cv

#endif //OPENCV_CORE_CVSTD_HPP
