Generic iterator declaration

[Hansel Stroem]

Is this legitimate STL code ? Compiler seems not to like the iterator ...

template <typename Tn>
ostream& operator<<(ostream& out, vector<TnVV)
{
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )
{
out << (*it);
}
return out << std::endl;
}
%icc BS.cc
BS.cc(151): error: expected a ";"
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )
^

BS.cc(151): error: identifier "it" is undefined
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )
^

compilation aborted for BS.cc (code 2)

[Victor Bazarov]

Hansel Stroem wrote:

Is this legitimate STL code ? Compiler seems not to like the iterator ...

No, it's not. It's missing a keyword or two.

>
template <typename Tn>
ostream& operator<<(ostream& out, vector<TnVV)

You should look into passing the vector by a reference to const:

... (ostream& out, vector<Tnconst& VV)

{
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )

Has to be

for ( typename vector<Tn>::iterator it = ...

(or, if you decide to pass the vector by a const ref,

for ( typename vector<Tn>::const_iterator it =

{
out << (*it);
}
return out << std::endl;
}
%icc BS.cc
BS.cc(151): error: expected a ";"
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )
^

BS.cc(151): error: identifier "it" is undefined
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )
^

compilation aborted for BS.cc (code 2)

V
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[=?UTF-8?B?5Lmm5ZGG5b2t?=]

Victor Bazarov 写�:

>{
for ( vector<Tn>::iterator it = VV.begin(); it != VV.end(); ++it )

Has to be

for ( typename vector<Tn>::iterator it = ...

(or, if you decide to pass the vector by a const ref,

for ( typename vector<Tn>::const_iterator it =

right.
use typename here.
see the standard.