CODEWITHSUNDEEP
c++vectorsetundeclared-identifier
OtagoHarbour
OtagoHarbour

Reputation: 4183

C++: 'set' and 'vector' "undeclared despite #include statements

I am using Netbeans 7.1 on Ubuntu 11.04.

The following call

set< Triangle > V;

gives the error message

error: ‘set’ was not declared in this scope

and the following call

vector< Triangle > ans;

gives the error message

error: ‘vector’ was not declared in this scope

This despite my having

#include <vector>
#include <set>
#include <map>

at the beginning of the C++ file.

At help resolving this would be greatly appreciated.
Peter.

Upvotes: 1

Views: 7983

Answers (3)

axelBrain
axelBrain

Reputation: 46

you forgot about namespace std :

std::set< Triangle > V; std::vector< Triangle > V;

Upvotes: 3

SCC
SCC

Reputation: 720

Vectors Sets and map are part of the c++ Standard Library so you need to call vector/set/map with

std::vector< Triangle > ans;

or add 

using namespace std;

after the include statements.

Upvotes: 6

Ed Swangren
Ed Swangren

Reputation: 124642

They live in the std namespace. So, either fully quality the types (std::vector) or use a using statement (using namespace std;).

The latter option pollutes the global namespace. Never do that in a header file (otherwise the entire namespace is imported when you include the header) and only do it in your implementation file if you know that it isn't going to cause any collisions.

#include <vector>

int main(...) {
    vector v;      // no worky
    std::vector v; // ok!
}

Upvotes: 2

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