Why can't I hide some symbol name if I use it as elements of an STL container?

Question

According to the answer, I hid the most internal characters of the shared library using the flag -fvisibility=hiddenand strip command from the building toolchain. But I found some characters that are used as standard elements of a C ++ container cannot be hidden.

For example,

/* example1.cpp */
#include <stdio.h>

#define MY_EXPORTS __attribute__((visibility("default")))

extern "C" {
MY_EXPORTS void* create();
MY_EXPORTS void  dosth(void*, int i);
MY_EXPORTS void  release(void*);
}

class Point {
  public:
    int x;
    int y;
    Point() {
        x = -1;
        y = -1;
    }
    Point(int x_, int y_) {
        x = x_;
        y = y_;
    }
    int X() const {return x;}
    int Y() const {return y;}
};

class ABC {
  Point pts[2];
  public:
    ABC() {
        Point pt0(0,0), pt1(1,1);
        pts[0] = pt0;
        pts[1] = pt1;
    }
    int getx(int i) { return pts[i].x; }
    int gety(int i) { return pts[i].y; }
};


MY_EXPORTS void* create()
{
    return new ABC();
}

MY_EXPORTS void dosth(void* handle, int i)
{
    ABC* p = (ABC*)handle;
    printf("%d,%d\n", p->getx(i), p->gety(i));
}

MY_EXPORTS void release(void* handle)
{
    ABC* p = (ABC*)handle;
    delete p;
}

Compiled example1.cpp like this

$ g++ -fPIC -shared -fvisibility=hidden ../example1.cpp -o libexample.so 
$ strip -R .comment -R .note libexample.so

And the command nm -D libexample.so | grep Pointreturns nothing.

Then I replace the C array with std::vector,

/* example2.cpp */
#include <stdio.h>
#include <vector>

#define MY_EXPORTS __attribute__((visibility("default")))

extern "C" {
MY_EXPORTS void* create();
MY_EXPORTS void  dosth(void*, int i);
MY_EXPORTS void  release(void*);
}

using std::vector;
class Point {
  public:
    int x;
    int y;
    Point() {
        x = -1;
        y = -1;
    }
    Point(int x_, int y_) {
        x = x_;
        y = y_;
    }
    int X() const {return x;}
    int Y() const {return y;}
};

class ABC {
    vector<Point> pts;
  public:
    ABC() {
        pts.push_back(Point(0,0));
        pts.push_back(Point(1,1));
    }
    int getx(int i) { return pts[i].x; }
    int gety(int i) { return pts[i].y; }
};


MY_EXPORTS void* create()
{
    return new ABC();
}

MY_EXPORTS void dosth(void* handle, int i)
{
    ABC* p = (ABC*)handle;
    printf("%d,%d\n", p->getx(i), p->gety(i));
}

MY_EXPORTS void release(void* handle)
{
    ABC* p = (ABC*)handle;
    delete p;
}

And I compiled example2.cpp, like this

$ g++ -fPIC -shared -fvisibility=hidden ../example2.cpp -o libexample.so 
$ strip -R .comment -R .note libexample.so

And the team will nm -D libexample.so | grep Pointprint something like this

000000000000311c W _ZN9__gnu_cxx13new_allocatorI5PointE10deallocateEPS1_m
00000000000030be W _ZN9__gnu_cxx13new_allocatorI5PointE7destroyEPS1_
0000000000003236 W _ZN9__gnu_cxx13new_allocatorI5PointE8allocateEmPKv
0000000000002aba W _ZN9__gnu_cxx13new_allocatorI5PointE9constructEPS1_RKS1_
...
0000000000002dd2 W _ZNSt6vectorI5PointSaIS0_EE3endEv 
0000000000002fde W _ZNSt6vectorI5PointSaIS0_EE5beginEv 
0000000000002942 W _ZNSt6vectorI5PointSaIS0_EE9push_backERKS0_

It seems that the dispenser and STL vector are implemented using a template. But why this information cannot be hidden?

- gcc-4.6, os - LMDE MATE Edition.

Answer 1

, STL. sTL, , .

, - , class MySecretObject, , , .

, -, , , , STL, . , , [ ].

/ STL. . , , , , .

, , : " , ".

Edit:

, , "" , :

class HidePoint
{
  public:
    Point p;
};

, , HidePoint, A W - , .

:

#define Point SomeOtherUniqueName

.