ISO C++ forbids declaration of 'vector' with no type:
1. Failure to post complete, compilable code.
2. Failure to include the proper header (#include ) - unless,of course, it's in the code you forgot to post.
3. Failure to qualify your reference to vector. It's std::vector (unless you've previously included: using std::vector;
And please don't put "using namespace std;" in the header file (just in
case you were tempted).
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