How to use struct declared in header file from source file c++?

Question

I have a header file (abc.hpp) as bellow:

#include <iostream>
#include <stdio.h>
#include <vector>
using std::vector;
class ABC {
public:
        struct BoxPoint {
            float x;
            float y;
        } ;
        vector<BoxPoint> getBoxPoint();

Then, in the source file (abc.cpp):

#include "abc.hpp"
vector<BoxPoint> ABC::getBoxPoint(){
   vector<BoxPoint> boxPointsl;
   BoxPoint xy = {box.x1, box.y1};
   boxPointsl.push_back(xy);
   return boxPointsl
}

When I compile, there is error:

error: ‘BoxPoint’ was not declared in this scope

at line vector<BoxPoint> ABC::getBoxPoint()

If I change to void ABC::getBoxPoint(), (also change in the header file and remove return boxPointsl, the error does not exist. Can you point me to why display the error and how to resolve it? Thank you!

You're asking for vector<BoxPoint>, not vector<ABC::BoxPoint> — tadman
– tadman, Commented Oct 6, 2022 at 5:24

Stack Danny · Accepted Answer · 2022-10-06 05:28:57Z

3

the symbol BoxPoint was only known inside ABC scope, outside you have to add the ABC scope, so ABC::BoxPoint:

#include "abc.hpp"
vector<ABC::BoxPoint> ABC::getBoxPoint(){
   vector<BoxPoint> boxPointsl;
   BoxPoint xy = {box.x1, box.y1};
   boxPointsl.push_back(xy);
   return boxPointsl
}

Inside the function you can use BoxPoint again, since we are inside the ABC scope again.

edited Oct 6, 2022 at 5:28

answered Oct 6, 2022 at 5:24

Stack Danny

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2 Comments

n. m. could be an AI Over a year ago

You don't need the ABC:: prefix inside the function body, as it is considered in the scope.

Nguyen Tien Su Over a year ago

Thank you very much! I solved my this problem!

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