On Tue, 8 Jun 2010 12:23:03 +0200, José Tomás Tocino García
cout << myTree.get<float>("sonido.limite", 0.);
If I compile using "g++ -o program testcase1.cpp -I." I get no errors,
but
if I add "-Wall", I get:
./boost/property_tree/detail/ptree_implementation.hpp: In function ‘int main(int, char**)’: ./boost/property_tree/detail/ptree_implementation.hpp:728: warning: dereferencing pointer ‘default_value’ does break strict-aliasing rules /usr/include/boost/optional/optional.hpp:422: note: initialized from here
What's the problem? It compiles and works properly, but it would be great to have a warning-free compilation output.
That's really weird, and looks more like a compiler bug to me than a valid warning. For sure, 'default_value' is certainly not initialized within optional.hpp. But then, the strict-aliasing warnings are flow-sensitive and thus emitted during optimization, which means that GCC's internal view of the source could be quite seriously messed up by then. Do you get the warning if you explicitly type the default value correctly, i.e. use '0.f' instead of '0.'? Sebastian