error , Symbol 'vector' could not be resolved

Question

I am using eclipse in linux to develop a c++ application and I am getting this editor annotation error "Symbol 'vector' could not be resolved" from the following code lines

std::vector<unsigned char> buffer;

I feel that some library is missing or the paths are not set. I explicitly downloaded STL but its of no use. Do I have to re install GCC on my linux ?

I suspect the problem is that you 'explicitly downloaded STL', that shouldn't be necessary and perhaps you made some mistake at that point. — john, Aug 08 '11 at 10:11
If the paths are not set you should get an error on `#include `. What's the *first* error in your output? — molbdnilo, Aug 08 '11 at 10:32
Did you try using gcc or cc outside of eclipse just to link a Hello World c++ file including vector? I would give that a shot. — Sid, Feb 14 '12 at 21:27

score 20 · Answer 1 · edited Feb 15 '12 at 12:22

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In Eclipse, right-click on the project name...Select Index...Rebuild.

edited Feb 15 '12 at 12:22

Lightness Races in Orbit

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answered Feb 14 '12 at 21:17

RDH

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FYI - not the same as a refresh (I thought it was). – Cookster Jan 25 '13 at 22:08

score 5 · Answer 2 · answered Aug 08 '11 at 09:38

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You need to include the STL vector definition in your program. Put:

#include <vector>

at the top of your file and it should work.

answered Aug 08 '11 at 09:38

StevieG

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i have included this at the top but of no use – Umair Zaman Aug 08 '11 at 10:06
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Err.. if you're going to downvote a post, at least have the decency to explain why... – StevieG Feb 22 '12 at 12:51
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And again.. this post is a year old now.. the answer is perfectly reasonable, and without any further response from the OP, there's not really much I can do to improve it. So if you're going to downvote, I'd love to know why?!? – StevieG Aug 17 '12 at 15:52
@StevieG your answer maybe right if there is an _compilation_ error. But op states that he is getting a **annotation** error. It is an specific problem to eclipse as it uses an different code scanner for the annotation task. I have a similar problem like op and my code is compiling and linking fine but eclipse still messes up the standard template library. – waynix May 23 '18 at 11:02

wgodoy · Answer 3 · 2012-12-18T19:39:56.830

I had the same issue. I believe the problem arises from how std:: autocompletion is updated. Eclipse should be getting this from the Path and Symbols, but it could be buggy. I had to clean all Eclipse settings after upgrading gcc (thus, g++), since you're in Linux it's under your home folder ~/.eclipse/.

Thus,

1) Re-started Eclipse after cleaning ~/.eclipse/.

2) checked that Path and Symbols (under right-click on project > General > Path and Symbols) included all the upgraded gcc and c++ include directories (vector should be under ./gcc/version/include/c++/version/)

3) Rebuild index.

4) Created a *.cpp file that includes the *.h where the error is showing. This will force Eclipse to backtrace dependencies for *.h.

5) Rebuild index and/or restart a few times as required, now I can see vector at the end of std:: autocompletion.

enter image description here (see picture)

Hope it helps!

I think that this answer is correct. The question is related to this other solved post: http://stackoverflow.com/questions/10803685/eclipse-cdt-symbol-cout-could-not-be-resolved . I solved the problem with a similar procedure to the one explained by @wgodoy (using the mentioned post). — jespestana, Apr 08 '13 at 20:07

score 2 · Answer 4 · edited May 23 '17 at 11:46

2

See Also related question: Eclipse CDT: Symbol 'cout' could not be resolved

for me the problem was that in #include <vector> somewhere there is #include <bits/c++config> which has a different include path than #include <vector>

i.e.: /usr/include/c++/4.6/x86_64-linux-gnu

edited May 23 '17 at 11:46

Community

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answered Dec 09 '13 at 10:24

Alexander Oh

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Subash Gowthaman · Answer 5 · 2017-12-23T07:58:43.667

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Apparently vector belongs to C++ standard template library from MinGW perspective. so in addition to

 #include <vector>

Add

using namespace std;

after the header file inclusions.

edited Dec 23 '17 at 07:58

answered Dec 23 '17 at 07:52

Subash Gowthaman

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score 1 · Answer 6 · answered Aug 08 '11 at 09:38

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#include<vector>

should be included at top.

answered Aug 08 '11 at 09:38

iammilind

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score 1 · Answer 7 · answered Aug 08 '11 at 09:39

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#include <vector>

Also, std::vector is template type, so you have to use it like

std::vector<char> buffer;

answered Aug 08 '11 at 09:39

J0HN

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score 1 · Answer 8 · answered Aug 08 '11 at 12:43

I feel that some library is missing or the paths are not set.

Yes, this sounds like a linker error. Linkers deal with symbols.

I explicitly downloaded STL but its of no use.

Hopefully you mean libstdc++, GNU's implementation of the C++ Standard Library, and you probably shouldn't have done this. Your toolchain comes with the proper stdlib implementation.

Do I have to re install GCC on my linux?

Probably wise. And let this installation handle the standard library.

Also, on the off-chance that you're playing with your compilation command line, remember to invoke g++ not gcc; g++ automatically links in the C++ runtimes and stdlib implementation, whereas gcc is designed for C.

score 0 · Answer 9 · edited Jul 11 '13 at 05:27

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Created a *.cpp file that includes the *.h where the error is showing. This will force Eclipse to backtrace dependencies for *.h.
Is working for me...

edited Jul 11 '13 at 05:27

Dilip Manek

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answered Jul 11 '13 at 05:10

guangge

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score 0 · Answer 10 · edited Jul 25 '18 at 17:53

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I know that this problem was already solved, but it still appears as the top result on Google.

Using Eclipse Neon for Linux I solved it with Quick Fix:

right click at "vector" in the editor,
then "Quick Fix"

edited Jul 25 '18 at 17:53

TheBat

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answered Jul 15 '16 at 12:01

score 0 · Answer 11 · answered Mar 16 '17 at 06:54

Most likely you have some system-specific include directories missing in your settings which makes it impossible for indexer to correctly parse iostream, thus the errors. Selecting Index -> Search For Unresolved Includes in the context menu of the project will give you the list of unresolved includes which you can search in /usr/include and add containing directories to C++ Include Paths and Symbols in Project Properties.

On my system I had to add /usr/include/c++/4.6/x86_64-linux-gnu for bits/c++config.h to be resolved and a few more directories.

Don't forget to rebuild the index (Index -> Rebuild) after adding include directories.

score -1 · Answer 12 · answered Apr 24 '15 at 05:30

-1

adding #include< vector > and using namespace std; solved my problem

answered Apr 24 '15 at 05:30

Ahmed_Faraz

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error , Symbol 'vector' could not be resolved

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