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#include <mutex>
#include <vector>
 
std::mutex protectBuffer;
std::vector<int> somevector;
 
void myfunction(int data)
{
    std::lock_guard<std::mutex> (protectBuffer);
    somevector.push_back(data);
}
 
int main()
{
    myfunction(3);
}
 

prog.cpp: In function ‘void myfunction(int)’:
prog.cpp:9:47: error: no matching function for call to ‘std::lock_guard<std::mutex>::lock_guard()’
     std::lock_guard<std::mutex> (protectBuffer);
                                               ^
prog.cpp:9:47: note: candidates are:
In file included from prog.cpp:1:0:
/usr/include/c++/4.8/mutex:416:7: note: std::lock_guard<_Mutex>::lock_guard(std::lock_guard<_Mutex>::mutex_type&, std::adopt_lock_t) [with _Mutex = std::mutex; std::lock_guard<_Mutex>::mutex_type = std::mutex]
       lock_guard(mutex_type& __m, adopt_lock_t) : _M_device(__m)
       ^
/usr/include/c++/4.8/mutex:416:7: note:   candidate expects 2 arguments, 0 provided
/usr/include/c++/4.8/mutex:413:16: note: std::lock_guard<_Mutex>::lock_guard(std::lock_guard<_Mutex>::mutex_type&) [with _Mutex = std::mutex; std::lock_guard<_Mutex>::mutex_type = std::mutex]
       explicit lock_guard(mutex_type& __m) : _M_device(__m)
                ^
/usr/include/c++/4.8/mutex:413:16: note:   candidate expects 1 argument, 0 provided

Standard output is empty