::basic_ios(const std::basic_ios<char, std::char_traits<char> >&)': E:/Print.cpp:33: instantiated from `std::ostream&
, unsigned int i = 2]' E:/Print.cpp:72: instantiated from here C:/Dev-Cpp/include/c++/3.3.1/bits/ios_base.h:668: error: ` std::ios_base::ios_base(const std::ios_base&)' is
, unsigned int i = 2]': E:/Print.cpp:72: instantiated from here E:/Print.cpp:33: error: initializing argument 3 of ` boost::_bi::bind_t<boost::_bi::unspecified, F, typename boost::_bi::list_av_2<A1, A2>::type> boost::bind(F, A1, A2) [with F =
, unsigned int i = 2]' E:/Print.cpp:72: instantiated from here C:/Dev-Cpp/include/boost/bind.hpp:62: error: no type named `result_type' in ` struct print<std::vector<int, std::allocator<int> , 1>' C:/Dev-Cpp/include/boost/bind/bind_template.hpp: In instantiation of `boost::_bi::bind_t<boost::_bi::unspecified,
, unsigned int i = 2]' E:/Print.cpp:72: instantiated from here C:/Dev-Cpp/include/boost/bind/bind_template.hpp:16: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified,
Dear all, A fragment of code of mine is like this: template <class Container, size_t i> struct print { ostream& operator () (const Container& c, ostream& out) const { if(out) { typedef typename Container::value_type value_type; typedef print<value_type, i - 1> NewPrint; NewPrint newPrint; for(typename Container::const_iterator j = c.begin(); j != c.end(); ++j) newPrint(*j, out); /*for_each(c.begin(), c.end(), bind(newPrint, _2, out)); //Error!*/ } return out; } }; AFAICS, there should be no harm in replacing that for with the for_each in the comments -- the one is marked with "//Error" I mean, except that "out" which is of type ostream& is not Copy-Constructible, and therefore _2 cannot be used against it. Anybody having a workarounds for that? Doesn't Boost have anything analog to boost::ref which can give me a Copy-Constructible beast? For your reference, you can find the whole program and the compiler error message in the P.S. TIA, --Hossein P.S. #include <iostream> #include <algorithm> #include <iterator> #include <vector> #include <boost/bind.hpp> #include <boost/mem_fn.hpp> using std::ostream; using std::cin; using std::cout; using std::copy; using std::for_each; using std::ostream_iterator; using std::vector; using boost::bind; using boost::mem_fn; template <class Container, size_t i> struct print { ostream& operator () (const Container& c, ostream& out) const { if(out) { typedef typename Container::value_type value_type; typedef print<value_type, i - 1> NewPrint; NewPrint newPrint; /* for(typename Container::const_iterator j = c.begin(); j != c.end(); ++j) newPrint(*j, out); */ for_each(c.begin(), c.end(), bind(newPrint, _2, out)); //Error! } return out; } }; template <class Container> struct print<Container, 1> { ostream& operator () (const Container& c, ostream& out) const { if(out) copy(c.begin(), c.end(), ostream_iterator<typename Container::value_type>(out, " ")); return out; } ostream& DoIt (const Container& c, ostream& out) const { if(out) copy(c.begin(), c.end(), ostream_iterator<typename Container::value_type>(out, " ")); return out; } }; int main() { int a1[] = {1, 2, 3, 4}; const size_t n(sizeof(a1)/sizeof(*a1)); vector<int> v(a1, a1 + n); print<vector<int>, 1> () (v, cout); int a2[n] = {5, 6, 7, 8}; vector<vector<int> > m; m.push_back(v); m.push_back(vector<int>(a2, a2 + n)); print<vector<vector<int> >, 2> () (m, cout); cin.get(); return 0; } Compiler: Default compiler Executing g++.exe... g++.exe "E:\Print.cpp" -o "E:\Print.exe" -I"C:\Dev-Cpp\include\c++" -I"C:\Dev-Cpp\include\c++\mingw32" -I"C:\Dev-Cpp\include\c++\backward" -I"C:\Dev-Cpp\include" -L"C:\Dev-Cpp\lib" C:/Dev-Cpp/include/c++/3.3.1/bits/ios_base.h: In copy constructor ` std::basic_ios<char, std::char_traits<char> print<Container, i>::operator()(const Container&, std::ostream&) const [with Container = std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > private E:/Print.cpp:33: error: within this context E:/Print.cpp: In member function `std::ostream& print<Container, i>::operator()(const Container&, std::ostream&) const [with Container = std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> print<std::vector<int, std::allocator<int> >, 1>, A1 = boost::arg<2>, A2 = std::basic_ostream<char, std::char_traits<char> >]' C:/Dev-Cpp/include/boost/bind.hpp: At global scope: C:/Dev-Cpp/include/boost/bind.hpp: In instantiation of `boost::_bi::result_traits<boost::_bi::unspecified, print<std::vector<int, std::allocator<int> >, 1> >': C:/Dev-Cpp/include/boost/bind/bind_template.hpp:16: instantiated from `boost::_bi::bind_t<boost::_bi::unspecified, print<std::vector<int, std::allocator<int> >, 1>, boost::_bi::list2<boost::arg<2>, boost::_bi::value<std::basic_ostream<char, std::char_traits<char> > > > >' E:/Print.cpp:33: instantiated from `std::ostream& print<Container, i>::operator()(const Container&, std::ostream&) const [with Container = std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > print<std::vector<int, std::allocator<int> >, 1>, boost::_bi::list2<boost::arg<2>, boost::_bi::value<std::basic_ostream<char, std::char_traits<char> > > > >': E:/Print.cpp:33: instantiated from `std::ostream& print<Container, i>::operator()(const Container&, std::ostream&) const [with Container = std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > print<std::vector<int, std::allocator<int> >, 1> >' C:/Dev-Cpp/include/boost/bind/bind_template.hpp:19: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, print<std::vector<int, std::allocator<int> >, 1> >' C:/Dev-Cpp/include/boost/bind/bind_template.hpp:25: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, print<std::vector<int, std::allocator<int> >, 1> >' C:/Dev-Cpp/include/boost/bind/bind_template.hpp:31: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, print<std::vector<int, std::allocator<int> >, 1> >' C:/Dev-Cpp/include/boost/bind/bind_template.hpp:31: confused by earlier errors, bailing out Execution terminated ___________________________________________________________ Switch an email account to Yahoo! 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