dependent-name ‘xxx::yyy’ is parsed as a non-type, but instantiation yields a type

简言之，就是说你该用typename的地方没用typename，如以下代码

1 template<class Cont> void frontInsertion(Cont& ci) {
2     copy(a, a + sizeof(a)/sizeof(Cont::value_type),
3         front_inserter(ci));
4     copy(ci.begin(), ci.end(),
5         ostream_iterator<typename Cont::value_type>(
6             cout, " "));
7     cout << endl;
8 }

报错：

error: dependent-name ‘Cont:: value_type’ is parsed as a non-type, but instantiation yields a type

note: say ‘typename Cont:: value_type’ if a type is meant

解决办法：

在第2行的Cont::value_type改为typename Cont::value_type即可

备注：

上面的代码用MS VisualStudio自带的编译器编译不会报错，但是GCC会报错。

dependent-name ‘xxx::yyy’ is parsed as a non-type, but instantiation yields a type

原文：http://www.cnblogs.com/qrlozte/p/4635474.html