Moten, I think this is *best* explained by the gcc release notes for 3.4 This release is the first one to throw this as an error and not a warning as you can produce in gcc 3.3. http://gcc.gnu.org/gcc-3.4/changes.html Under C++. The third bullet. The summary is that you need to explicitly specify that const_iterator with the 'typename' keyword before it. corey On Sun, 06 Feb 2005 15:12:22 +0100, Morten.Gulbrandsen <f1000mhz@xxxxxxxx> wrote: > Hello, > > Nice to have the list members back on the net, > > I have a problem with some Standard template Library code examples. > > It looks nice on the paper, but my GCC 3.3.2 womits. > > I have consulted a nice tutorial introduction about templates and > especially STL, > > so the code is from here : > > http://www.libertyassociates.com/pages/files/TYCPP4eSource2.zip > > Please help here are the error messages: > > 4eList1910_UNIX.cpp: > In function > `void ShowMap(const std::map<T, A, std::less<_Key>, > std::allocator<std::pair<const _Key, _Tp> > >&)': > 4eList1910_UNIX.cpp: > 107: error: > parse error before `=' token > > // > // Display map properties > // > template<class T, class A> > void ShowMap(const map<T, A>& v) > { > for (map<T, A>::const_iterator ci = v.begin(); // line 107 > > /*=======================!!=========================*/ > > ci != v.end(); ++ci) > cout << ci->first << ": " << ci->second << "\n"; > > cout << endl; > } > > 4eList1910_UNIX.cpp: > In function > `void ShowMap(const std::map<T, A, std::less<_Key>, > std::allocator<std::pair<const _Key, _Tp> > >&) > [with T = std::string, A = Student]': > > 4eList1910_UNIX.cpp:93: instantiated from here > > template<class T, class A> > void ShowMap(const map<T, A>& v); // display map properties > > typedef map<string, Student> SchoolClass; > > ShowMap(MathClass); // Line 93 > > 4eList1910_UNIX.cpp:107: error: `ci' undeclared (first use this function) > 4eList1910_UNIX.cpp:107: error: (Each undeclared identifier is reported > only > once for each function it appears in.) > > g++ -v > Reading specs from /opt/sfw/gcc-3/lib/gcc-lib/i386-pc-solaris2.9/3.3.2/specs > Configured with: ../gcc-3.3.2/configure --prefix=/opt/sfw/gcc-3 > --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --without-gnu-ld > --without-gnu-as --enable-shared > Thread model: posix > gcc version 3.3.2 > > I compiled and linked without any makefile, using these options > > g++ -ansi -pedantic -Wall -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L > /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++ > > obviously the code is not free from warnings and not ANSI compatible, > but if I use these options > > g++ -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L /opt/sfw/gcc-3/lib/ > -R /opt/sfw/gcc-3/lib/ -lstdc++ > 4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A, > std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)': > 4eList1910_UNIX.cpp:107: warning: `std::map<T, A, std::less<_Key>, > std::allocator<std::pair<const _Key, _Tp> > >::const_iterator' is > implicitly > a typename > 4eList1910_UNIX.cpp:107: warning: implicit typename is deprecated, > please see > the documentation for details > > without the command line -options -ansi -pedantic -Wall > > the code compiles, links and actually runs. > > Please help. > > How can I improve the code, in order to make it unambiguous for gcc > 3.3.2 ? > > Yours Sincerely > > Morten Gulbrandsen > > > #include <iostream> > #include <string> > #include <map> > using namespace std; > > class Student > { > public: > Student(); > Student(const string& name, const int age); > Student(const Student& rhs); > ~Student(); > > void SetName(const string& name); > string GetName() const; > void SetAge(const int age); > int GetAge() const; > > Student& operator=(const Student& rhs); > > private: > string itsName; > int itsAge; > }; > > Student::Student() > : itsName("New Student"), itsAge(16) > {} > > Student::Student(const string& name, const int age) > : itsName(name), itsAge(age) > {} > > Student::Student(const Student& rhs) > : itsName(rhs.GetName()), itsAge(rhs.GetAge()) > {} > > Student::~Student() > {} > > void Student::SetName(const string& name) > { > itsName = name; > } > > string Student::GetName() const > { > return itsName; > } > > void Student::SetAge(const int age) > { > itsAge = age; > } > > int Student::GetAge() const > { > return itsAge; > } > > Student& Student::operator=(const Student& rhs) > { > itsName = rhs.GetName(); > itsAge = rhs.GetAge(); > return *this; > } > > ostream& operator<<(ostream& os, const Student& rhs) > { > os << rhs.GetName() << " is " << rhs.GetAge() << " years old"; > return os; > } > > template<class T, class A> > void ShowMap(const map<T, A>& v); // display map properties > > typedef map<string, Student> SchoolClass; > > int main() > { > Student Harry("Harry", 18); > Student Sally("Sally", 15); > Student Bill("Bill", 17); > Student Peter("Peter", 16); > > SchoolClass MathClass; > MathClass[Harry.GetName()] = Harry; > MathClass[Sally.GetName()] = Sally; > MathClass[Bill.GetName()] = Bill; > MathClass[Peter.GetName()] = Peter; > > cout << "MathClass:\n"; > ShowMap(MathClass); > > cout << "We know that " << MathClass["Bill"].GetName() > << " is " << MathClass["Bill"].GetAge() << " years old\n"; > > return 0; > } > > // > // Display map properties > // > template<class T, class A> > void ShowMap(const map<T, A>& v) > { > for (map<T, A>::const_iterator ci = v.begin(); > ci != v.end(); ++ci) > cout << ci->first << ": " << ci->second << "\n"; > > cout << endl; > } > > /* > > g++ -ansi -pedantic -Wall -o 4eList1910_UNIX.out 4eList1910_UNIX.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++ > > 4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A, > std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&)': > 4eList1910_UNIX.cpp:107: error: parse error before `=' token > 4eList1910_UNIX.cpp: In function `void ShowMap(const std::map<T, A, > std::less<_Key>, std::allocator<std::pair<const _Key, _Tp> > >&) [with T = > std::string, A = Student]': > 4eList1910_UNIX.cpp:93: instantiated from here > 4eList1910_UNIX.cpp:107: error: `ci' undeclared (first use this function) > 4eList1910_UNIX.cpp:107: error: (Each undeclared identifier is reported only > once for each function it appears in.) > > g++ -v > Reading specs from /opt/sfw/gcc-3/lib/gcc-lib/i386-pc-solaris2.9/3.3.2/specs > Configured with: ../gcc-3.3.2/configure --prefix=/opt/sfw/gcc-3 --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --without-gnu-ld --without-gnu-as --enable-shared > Thread model: posix > gcc version 3.3.2 > > */ > > >
