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/*
* STL Utility Functions
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_STL_UTIL_H__
#define BOTAN_STL_UTIL_H__
#include <map>
namespace Botan {
/*
* Copy-on-Predicate Algorithm
*/
template<typename InputIterator, typename OutputIterator, typename Predicate>
OutputIterator copy_if(InputIterator current, InputIterator end,
OutputIterator dest, Predicate copy_p)
{
while(current != end)
{
if(copy_p(*current))
*dest++ = *current;
++current;
}
return dest;
}
/*
* Searching through a std::map
*/
template<typename K, typename V>
inline V search_map(const std::map<K, V>& mapping,
const K& key,
const V& null_result = V())
{
typename std::map<K, V>::const_iterator i = mapping.find(key);
if(i == mapping.end())
return null_result;
return i->second;
}
template<typename K, typename V, typename R>
inline R search_map(const std::map<K, V>& mapping, const K& key,
const R& null_result, const R& found_result)
{
typename std::map<K, V>::const_iterator i = mapping.find(key);
if(i == mapping.end())
return null_result;
return found_result;
}
/**
* Function adaptor for delete operation
*/
template<class T>
class del_fun : public std::unary_function<T, void>
{
public:
void operator()(T* ptr) { delete ptr; }
};
/**
* Delete the second half of a pair of objects
*/
template<typename Pair>
void delete2nd(Pair& pair)
{
delete pair.second;
}
/**
* Insert a key/value pair into a multimap
*/
template<typename K, typename V>
void multimap_insert(std::multimap<K, V>& multimap,
const K& key, const V& value)
{
multimap.insert(std::make_pair(key, value));
}
}
#endif
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