Vector of vectors of T in template<T> class
Question
Why this code does not compile (Cygwin)?
#include <vector>
template <class Ttile>
class Tilemap
{
typedef std::vector< Ttile > TtileRow;
typedef std::vector< TtileRow > TtileMap;
typedef TtileMap::iterator TtileMapIterator; // error here
};
error: type
std::vector<std::vector<Ttile, std::allocator<_CharT> >, std::allocator<std::vector<Ttile, std::allocator<_CharT> > > >' is not derived from type
Tilemap'
Solution
Because the TtileMap::iterator
is not known to be a type yet. Add the typename
keyword to fix it
typedef typename TtileMap::iterator TtileMapIterator;
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