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/*
* Copyright (C) 2007-2019 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_UTIL_H
#define BU_UTIL_H
#ifndef NULL
# define NULL 0
#endif
/* I borrowed this from someone who borrowed it from glib who borrowed it
* from...
*/
#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
# define DEPRECATED __attribute__((__deprecated__))
#else
# define DEPRECATED
#endif /* __GNUC__ */
#include <string.h>
namespace Bu
{
/**
* Swap the value of two variables, uses references, so it's pretty safe.
* Objects passed in must support a basic assignemnt operator (=);
*@param a Variable to recieve the value of parameter b
*@param b Variable to recieve the value of parameter a
*/
template<typename item>
void swap( item &a, item &b )
{
item tmp = a;
a = b;
b = tmp;
}
/**
* Finds the lesser of the two objects, objects passed in must be
* less-than-comparable.
*@param a A value to test.
*@param b Another value to test.
*@returns A reference to the lesser of a or b.
*/
template<typename item>
const item &buMin( const item &a, const item &b )
{
return a<b?a:b;
}
/**
* Finds the lesser of the two objects, objects passed in must be
* less-than-comparable.
*@param a A value to test.
*@param b Another value to test.
*@returns A reference to the lesser of a or b.
*/
template<typename item>
item &buMin( item &a, item &b )
{
return a<b?a:b;
}
/**
* Finds the greater of the two objects, objects passed in must be
* less-than-comparable.
*@param a A value to test.
*@param b Another value to test.
*@returns A reference to the greater of a or b.
*/
template<typename item>
const item &buMax( const item &a, const item &b )
{
return b<a?a:b;
}
/**
* Finds the greater of the two objects, objects passed in must be
* less-than-comparable.
*@param a A value to test.
*@param b Another value to test.
*@returns A reference to the greater of a or b.
*/
template<typename item>
item &buMax( item &a, item &b )
{
return b<a?a:b;
}
/**
* Given three objects this finds the one between the other two.
*@param a A value to test.
*@param b Another value to test.
*@param c Yet another value to test.
*@returns A reference to the mid-value of a, b, and c.
*/
template<typename item>
const item &buMid( const item &a, const item &b, const item &c )
{
return buMin( buMax( a, b ), c );
}
/**
* Given three objects this finds the one between the other two.
*@param a A value to test.
*@param b Another value to test.
*@param c Yet another value to test.
*@returns A reference to the mid-value of a, b, and c.
*/
template<typename item>
item &buMid( item &a, item &b, item &c )
{
return buMin( buMax( a, b ), c );
}
//
// Basic comparison functors
//
/**
* Simple less-than comparison functor. Objects being used should be
* less-than-comparable.
*/
template<typename item>
struct __basicLTCmp
{
bool operator()( const item &a, const item &b )
{
return a < b;
}
};
/**
* Simple greater-than comparison functor. Objects being used should be
* greater-than-comparable.
*/
template<typename item>
struct __basicGTCmp
{
bool operator()( const item &a, const item &b )
{
return a > b;
}
};
/**
* As __basicLTCmp but dereferences the passed in pointers before comparing.
*/
template<typename item>
struct __basicPtrLTCmp
{
bool operator()( const item &a, const item &b )
{
return *a < *b;
}
};
/**
* As __basicGTCmp but dereferences the passed in pointers before comparing.
*/
template<typename item>
struct __basicPtrGTCmp
{
bool operator()( const item &a, const item &b )
{
return *a > *b;
}
};
/**
* Get the number of days in the month in the gregorian calendar, taking
* leap years into account.
*/
int getDaysInMonth( int iMonth, int iYear );
void memcpy( void *pDest, const void *pSrc, size_t iBytes );
};
#endif
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