N.B. This has already been answered on gcc-help, where it belongs. Sorry for not updating this list to say so.
I've also now added this topic to the isocpp.org FAQ: https://isocpp.org/wiki/faq/templates#dependent-name-lookup-types On 2 December 2016 at 12:12, chenzero wrote: > Hello, > > I have following code, > > in gcc 4.8.4, the code can NOT compile, because of an error: > error: need ‘typename’ before ‘std::map<K, V>::iterator’ because > ‘std::map<K, V>’ is a dependent scope > > however, I can compile the same code in other C++ compiler(borland c++), > > whether there are some differences between gcc template syntax? > > Thank you very much! > > c.z. > > > // code > //----------------------------------------------------------- > > #include <stdio.h> > > #include <map> > #include <vector> > using namespace std; > > /** > * get all keys of the map into vector > */ > template<typename K, typename V> > static void getKeySet(std::map<K,V>& m, std::vector<K>& ks) { > std::map<K,V>::iterator iter = m.begin(); > for(iter=m.begin();iter!=m.end();iter++) { > ks.push_back(iter->first); > } > } > > int main() { > map<int,int> m1; > //m1[1] = 1; > vector<int> ks; > getKeySet(m1, ks); > printf("key size: %d\n", ks.size()); > return 0; > } > > >
