Re: template & STL

peter koch <>
Fri, 19 Sep 2008 11:06:48 -0700 (PDT)
On 19 Sep., 19:44, dawid <> wrote:

Hi, I'm trying to compile this template:

  1 #include <set>
  3 using std::set;
  5 template <class TYPE>
  6 void function(const set<TYPE> &data) {
  7 for (set<TYPE>::const_iterator iter = data.begin(); iter !=
data.end(); iter++) {
  8 }
  9 }

g++ 4.2.3 prints:
g++ temp.cpp -o temp
temp.cpp: In function =91void function(const std::set<TYPE,
std::less<_Key>, std::allocator<_CharT> >&)':
temp.cpp:7: error: expected `;' before =91iter'
temp.cpp:7: error: =91iter' was not declared in this scope
make: *** [temp] Error 1

What is wrong ??

You forgot a typename: line 7 should read:
    for (typename set<TYPE>::const_iterator iter = data.begin(); iter !

The reason is template specialisation: a template class could be
specialised, meaning that set<TYPE> might not have a const_iterator.
You and I know that this is silly for std::set, but the compiler does


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