Steven Watanabe wrote:
AMDG
Yang Zhang wrote:
Hi, I can't figure out how to properly use noncopyable. I'm always getting things like "has a non-virtual destructor" warnings.
Do you have a simple test case?
$ cat noncopyable.cc #include <boost/noncopyable.hpp> using namespace boost; class C : noncopyable {}; int main() { return 0; } $ g++ -Wall -g3 -o noncopyable noncopyable.cc -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 -Wall -Werror -Wextra -Weffc++ -Wstrict-null-sentinel -Wno-old-style-cast -Woverloaded-virtual -Wsign-promo -Wformat=2 -Winit-self -Wswitch-enum -Wunused -Wstrict-overflow -Wfloat-equal -Wundef -Wunsafe-loop-optimizations -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -Wconversion -Wlogical-op -Wno-aggregate-return -Wno-missing-declarations -Wno-missing-field-initializers -Wmissing-noreturn -Wmissing-format-attribute -Wpacked -Wredundant-decls -Wunreachable-code -Winline -Winvalid-pch -Wlong-long -Wvolatile-register-var -Wstack-protector cc1plus: warnings being treated as errors noncopyable.cc:3: error: base class âclass boost::noncopyable_::noncopyableâ has a non-virtual destructor I understand that this shouldn't be a problem as noncopyable is not meant to be used directly as any variable's static type, but I do require enabling this warning. I currently use the following simple macro: /** For use within a type definition. Makes the type non-copyable. */ #define NONCOPYABLE(type) \ private: \ type(const type&); \ void operator=(const type&);
In fact, compiling noncopyable_test.cpp gives me:
<snip error message>
Any hints? Thanks in advance.
noncopyable_test.cpp isn't supposed to compile. Did you read the comment?
// This program demonstrates compiler errors resulting from trying to copy // construct or copy assign a class object derived from class noncopyable.
Sorry, I did not. -- Yang Zhang http://www.mit.edu/~y_z/