std::unique_lock, std::shared_lock, std::lock_guard
suggest changeUsed for the RAII style acquiring of try locks, timed try locks and recursive locks.
std::unique_lock
allows for exclusive ownership of mutexes.
std::shared_lock
allows for shared ownership of mutexes. Several threads can hold std::shared_locks
on a std::shared_mutex
. Available from C++ 14.
std::lock_guard
is a lightweight alternative to std::unique_lock
and std::shared_lock
.
#include <unordered_map>
#include <mutex>
#include <shared_mutex>
#include <thread>
#include <string>
#include <iostream>
class PhoneBook {
public:
std::string getPhoneNo( const std::string & name )
{
std::shared_lock<std::shared_timed_mutex> l(_protect);
auto it = _phonebook.find( name );
if ( it != _phonebook.end() )
return (*it).second;
return "";
}
void addPhoneNo ( const std::string & name, const std::string & phone )
{
std::unique_lock<std::shared_timed_mutex> l(_protect);
_phonebook[name] = phone;
}
std::shared_timed_mutex _protect;
std::unordered_map<std::string,std::string> _phonebook;
};
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