Subject: [Boost-users] How to use noncopyable?
From: Yang Zhang (yanghatespam_at_[hidden])
Date: 2009-02-21 23:25:32
Hi, I can't figure out how to properly use noncopyable. I'm always
getting things like "has a non-virtual destructor" warnings. In fact,
compiling noncopyable_test.cpp gives me:
$ g++ -Wall -g3 -o noncopyable_test noncopyable_test.cpp -Wextra
-Wconversion -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings
-Winit-self -Wno-unused-parameter -Wparentheses
-Wmissing-format-attribute -Wfloat-equal -Winline -Woverloaded-virtual
-Wsign-promo -Wc++0x-compat -Wsynth
/opt/armed/include/boost/noncopyable.hpp: In copy constructor
‘<unnamed>::DontTreadOnMe::DontTreadOnMe(const<unnamed>::DontTreadOnMe&)’:
/opt/armed/include/boost/noncopyable.hpp:27: error:
‘boost::noncopyable_::noncopyable::noncopyable(const
boost::noncopyable_::noncopyable&)’ is private
noncopyable_test.cpp:22: error: within this context
noncopyable_test.cpp: In function ‘int main()’:
noncopyable_test.cpp:32: note: synthesized method
‘<unnamed>::DontTreadOnMe::DontTreadOnMe(const<unnamed>::DontTreadOnMe&)’
first required here
/opt/armed/include/boost/noncopyable.hpp: In member function
‘<unnamed>::DontTreadOnMe&<unnamed>::DontTreadOnMe::operator=(const<unnamed>::DontTreadOnMe&)’:
/opt/armed/include/boost/noncopyable.hpp:28: error: ‘const
boost::noncopyable_::noncopyable&
boost::noncopyable_::noncopyable::operator=(const
boost::noncopyable_::noncopyable&)’ is private
noncopyable_test.cpp:22: error: within this context
noncopyable_test.cpp: In function ‘int main()’:
noncopyable_test.cpp:33: note: synthesized method
‘<unnamed>::DontTreadOnMe&<unnamed>::DontTreadOnMe::operator=(const<unnamed>::DontTreadOnMe&)’
first required here
Any hints? Thanks in advance.
-- Yang Zhang http://www.mit.edu/~y_z/