Re: Mutex scoped_lock compile errors

From: Russell Hind (yg-boost-users_at_[hidden])
Date: 2003-06-10 02:43:43

> logger.cpp:36: error: no matching function for call to `
>    boost::detail::thread::scoped_lock<boost::mutex>::scoped_lock(const
>    boost::mutex&)'

If the mutex is a member variable, then in the const method, it is a 
const mutex.  scoped_lock requires a non-const mutex.  This is what is 
causing the error.

Declare the mutex as mutable so it appears as non-const even in const 
members.  (I don't know if this is the preferred way, but it is the way 
I currently use).

It works if the mutex is declared in the .cpp because it is not part of 
the class, and therefore isn't const when accessed inside a const method.

HTH

Russell