stl_util.h

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/*
* STL Utility Functions
* (C) 1999-2007 Jack Lloyd
* (C) 2015 Simon Warta (Kullo GmbH)
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_STL_UTIL_H_
#define BOTAN_STL_UTIL_H_
 
#include <vector>
#include <string>
#include <map>
#include <set>
#include <botan/secmem.h>
 
namespace Botan {
 
inline std::vector<uint8_t> to_byte_vector(const std::string& s)
   {
   return std::vector<uint8_t>(s.cbegin(), s.cend());
   }
 
inline std::string to_string(const secure_vector<uint8_t> &bytes)
   {
   return std::string(bytes.cbegin(), bytes.cend());
   }
 
/**
* Return the keys of a map as a std::set
*/
template<typename K, typename V>
std::set<K> map_keys_as_set(const std::map<K, V>& kv)
   {
   std::set<K> s;
   for(auto&& i : kv)
      {
      s.insert(i.first);
      }
   return s;
   }
 
/*
* Searching through a std::map
* @param mapping the map to search
* @param key is what to look for
* @param null_result is the value to return if key is not in mapping
* @return mapping[key] or null_result
*/
template<typename K, typename V>
inline V search_map(const std::map<K, V>& mapping,
                    const K& key,
                    const V& null_result = V())
   {
   auto 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)
   {
   auto i = mapping.find(key);
   if(i == mapping.end())
      return null_result;
   return found_result;
   }
 
/*
* 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));
   }
 
/**
* Existence check for values
*/
template<typename T>
bool value_exists(const std::vector<T>& vec,
                  const T& val)
   {
   for(size_t i = 0; i != vec.size(); ++i)
      if(vec[i] == val)
         return true;
   return false;
   }
 
template<typename T, typename Pred>
void map_remove_if(Pred pred, T& assoc)
   {
   auto i = assoc.begin();
   while(i != assoc.end())
      {
      if(pred(i->first))
         assoc.erase(i++);
      else
         i++;
      }
   }
 
}
 
#endif