I have a logging method called trace
:
template <typename... Args>
void trace(const LogLevel ll, QString&& msg, Args... args)
{
// operate on input data
}
Now I would like to create a wrapper function, with the same interface, that would call my trace
function:
template <typename... Args>
void wrapper(const LogLevel ll, QString&& msg, Args... args)
{
trace(ll, std::move(msg), args);
}
But this will not compile. I think I am not allowed to pass args
this way. How can this functionality be accomplished?
You need to expand the pack like
template <typename... Args>
void wrapper(const LogLevel ll, QString&& msg, Args... args)
{
trace(ll, std::move(msg), args...);
}
Also note that you can use perfect forwarding as well so you don't cause copies. That would look like
template <typename... Args>
void wrapper(const LogLevel ll, QString&& msg, Args&&... args)
{
trace(ll, std::move(msg), std::forward<Args>(args)...);
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.