Errors when trying to use a vector

Question

At the top of my file main.h I have:

#include <vector>

class Blah
{
  public:
    Blah(){}
    ~Blah(){}
  protected:
    vector<int> someVector;
  public:
    //methods
};

When I try to compile, the vector declaration line gives the errors:

error C2143: syntax error : missing ';' before '<'

error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

error C2238: unexpected token(s) preceding ';'

I can't figure out what's causing this. Anybody see what I'm doing wrong?

`error: no template named 'vector'; did you mean 'std::vector'?` ... I'm *quickly* warming up to the error messages clang produces... — Drew Dormann, Apr 04 '13 at 01:47

score 10 · Accepted Answer · answered Apr 04 '13 at 01:37

10

The vector class is part of the std namespace. You need to replace your declaration with std::vector<int> instead.

answered Apr 04 '13 at 01:37

Brandon Buck

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4

+1 Completely correct! - but *please* don't encourage `using namespace std` :) – Drew Dormann Apr 04 '13 at 01:37
@DrewDormann I've seen it in major libraries, but duly noted. – Brandon Buck Apr 04 '13 at 01:38
Really? I'm honestly curious now... I've only seen it as something that students have to *unlearn*. – Drew Dormann Apr 04 '13 at 01:39
@izuriel - "major libraries" is not the same as "well-designed libraries". – Pete Becker Apr 04 '13 at 12:54
@PeteBecker I never said "well-designed libraries" either (and corrected the answer) :P – Brandon Buck Apr 04 '13 at 15:49
@izuriel - I see: you were pointing out other places where you've seen it. Still, I'll leave the comment alone, as a caution. – Pete Becker Apr 04 '13 at 17:40

score 5 · Answer 2 · answered Apr 04 '13 at 01:37

5

It's in the std namespace:

std::vector<int> someVector;

answered Apr 04 '13 at 01:37

Pubby

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score 3 · Answer 3 · edited May 23 '17 at 10:31

3

vector is part of the std namespace and so you need to add std:: to your declaration:

std::vector<int> someVector;

Since the suggestion was made in another answers, I want to also discourage the use of using namespace std since it is considered bad practice

edited May 23 '17 at 10:31

Community

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answered Apr 04 '13 at 01:37

Shafik Yaghmour

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score 0 · Answer 4 · answered Sep 08 '21 at 15:18

0

Instead of using,

std::vector someVector;

Always try to use,

using namespace std;

Because it will help you not to type 'std::' again and again, and it is not considered a good practice.

answered Sep 08 '21 at 15:18

Jigyasu Dhingra

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Errors when trying to use a vector

4 Answers4