Linux共享库c

我在Linux下使用Eclipce.我使用-L和-l设置了库的路径.但我的功能在程序中不可见.

你能解释一下共享图书馆是如何运作的吗？

问候.

编辑：

我收到以下错误：

int main() {
    char* path = "/export/home/pdmazubi3/workspace/proj1/src/pic.jpg";
    CEDD_Descriptor::CEDD ced; // undefined reference to `CEDD_Descriptor::CEDD::CEDD[in-charge]()'
    ced.execute(path);
}

标题：

class CEDD
    {
        public:
            CEDD(double Th0,double Th1,double Th2,double Th3,bool CompactDescriptor);
            CEDD();
            ~CEDD(void);

            double T0;
            double T1;
            double T2;
            double T3;
            bool Compact;

            double* execute(char* path);

        private:
            int cedd_segnum;                //number of segments
            int* cedd_partitionSize;        //number of pixels in each segment
    };