#pragma once

#ifndef TUTIL_INCLUDED

#define TUTIL_INCLUDED

#include "tcommon.h"

#include <math.h></math.h>

#ifdef _WIN32

#include <windows.h></windows.h>

#include <winbase.h></winbase.h>

#endif

//! Type definition for a pair of double.

typedef std::pair<double, double=""> DoublePair;</double,>

//! Type definition for a pair of integer.

typedef std::pair<int, int=""> IntPair;</int,>

//! Square of x.

/*!

  \par x val to square

 */

template <class t=""></class>

inline T sq(T x)

{

	return x * x;

}

//! Calculates the floor of a value.

/*!

  Return the largest integer that is less than or equal to x.

  \par x val to floor

  \ret largest integer that is less than or equal to x

 */

inline int tfloor(double x)

{

	return ((int)(x) > (x) ? (int)(x)-1 : (int)(x));

}

//! Calculates the ceiling of a value.

/*!

  Return the smallest integer that is greater than or equal to x.

  \par x val to floor

  \ret smallest integer that is greater than or equal to x.

 */

inline int tceil(double x)

{

	return ((int)(x) < (x) ? (int)(x) + 1 : (int)(x));

}

//! Check if value is an integer.

/*!

  Return largest integer that is less than or equal to x

  \par x val to test

  \ret true if val is integer

 */

inline bool isInt(double x)

{

	return (int)(x) == (x);

}

inline int tfloor(int x, int step)

{

	return step * (x >= 0 ? (x / step) : -((-1 - x + step) / step));

}

inline int tceil(int x, int step)

{

	return step * (x >= 0 ? ((x + step - 1) / step) : -((-x) / step));

}

inline int intLE(double x)

{

	return tfloor(x);

}

inline int intGT(double x)

{

	return tfloor(x) + 1;

}

inline int intLT(double x)

{

	return tceil(x) - 1;

}

inline int intGE(double x)

{

	return tceil(x);

}

//! convert radiant to degree

/*!

  Convert an angle from radiant to angle.

  \par angle in radiant

  \ret angle in degree

 */

inline double rad2degree(double rad)

{

	return rad * TConsts::invOf_pi_180;

}

//! convert degree to radiant

/*!

  Convert an angle from degree to radiant.

  \par angle in degree

  \ret angle in radiant

 */

inline double degree2rad(double degree)

{

	return degree * TConsts::pi_180;

}

//! Sign of argument.

/*!

 Return sign of argument.

 \par arg value to test

 \ret -1 if arg is negative, 1 if arg is positive, 0 if arg is zero

 */

template <class t=""></class>

inline int tsign(T arg)

{

	return arg < 0 ? -1 : arg > 0 ? 1 : 0;

}

//! Check if two values are very similar.

/*!

  Check if two values are very similar.

  \par a first value

  \par b second value

  \par err max distance from value

  \ret bool if value are very similar.

 */

inline bool areAlmostEqual(double a, double b, double err = TConsts::epsilon)

{

	return fabs(a - b) < err;

}

//! Check if two values are very similar.

/*!

  Check if two values are very similar.

  \par a first value

  \par b second value

  \par err max distance from value

  \ret bool if value are very similar.

 */

template <class t=""></class>

inline bool areAlmostEqual(const T &a, const T &b, double err = TConsts::epsilon)

{

	return tdistance(a, b) < err;

}

struct TDeleteObjectFunctor {

	template <typename t=""></typename>

	void operator()(T *ptr)

	{

		delete ptr;

	}

};

//! Clear a container deleting all elements.

/*!

  Clear a container, but before recall delete for all elements.

  \par c container

  \note the code doesn't work with map because it's impossible

        to deduce template

 */

template <class t=""></class>

inline void clearPointerContainer(T &c) throw()

{

	T tmp;

	std::for_each(c.begin(), c.end(), TDeleteObjectFunctor());

	c.swap(tmp);

}

#endif