Hi eric, On Sun, Jul 10, 2011 at 11:32:56PM -0700, eric wrote: > Dear c++ programers: > > If you are also an g++ programers, especially ever create/modify its > source code, I need your help > I have a piece simple code about formatting a date/time as a string > from a book. its authors claim it work in vc++7.1 on xp. > but my g++4.5.2 didn't pass it on compile stage > ------------------------------------------------------------------------------------------- > eric@eric-laptop:~/cppcookbook/ch5$ g++ Example5-4.cpp > Example5-4.cpp: In function ‘std::ostream& > formatDatetime(std::ostream&, const tm&, const char*)’: > Example5-4.cpp:16:17: error: invalid use of incomplete type ‘const > struct std::time_put<char>’ I assume it's the same problem as with most of your examples: this is probably no valid C++ code. You use the class std::time_put in file Example5-4.cpp, line 16. But in the headers you include, this class is only forward declared, but not defined ==> the compiler can't continue. Did you really include <locale> ? Axel
