Linux上的C++动态共享库

g++ -shared -o libexample.so example.cpp

void *handle;
double (*cosine)(double);
char *error;

handle = dlopen("libexample.so", RTLD_LAZY);
if (!handle) {
    fprintf(stderr, "%s\n", dlerror());
    exit(1);
}

cosine = (double (*)(double)) dlsym(handle, "cosine");
error = dlerror();
if (error != NULL) {
    fprintf(stderr, "%s\n", error);
    exit(1);
}

double result = cosine(3.14159);
printf("The cosine of %f is %f\n", 3.14159, result);
dlclose(handle);