code. compile. run. debug. share.
#include <memory>
// Shims to enable shared_from(this) or shared_from(pointer)
template <typename T>
inline std::shared_ptr<T> shared_from_enabled(std::enable_shared_from_this<T>* base) {
return base->shared_from_this();
}
template <typename T>
inline std::shared_ptr<const T> shared_from_enabled(std::enable_shared_from_this<T> const* base) {
return base->shared_from_this();
}
template <typename T>
inline std::shared_ptr<T> shared_from(T* derived) {
return std::static_pointer_cast<T>(shared_from_enabled(derived));
}
// Example class Hierarchy
struct base : public std::enable_shared_from_this<base> {};
struct derived : public base
{
auto shared_from_this() {
return shared_from(this);
}
auto shared_from_this() const {
return shared_from(this);
}
};
template <typename X>
struct derived_x : public derived
{
auto shared_from_this() {
return shared_from(this);
}
};
// Compilation test
int main()
{
auto pbase = std::make_shared<base>();
auto pderived = std::make_shared<derived>();
auto pderived_x = std::make_shared<derived_x<int> >();
auto const& const_pderived = *pderived;
const_pderived.shared_from_this();
shared_from(&const_pderived); // Can just use the external function
std::shared_ptr<base> test1 = pbase->shared_from_this();
std::shared_ptr<derived> test2 = pderived->shared_from_this();
std::shared_ptr<derived_x<int> > test3 = pderived_x->shared_from_this();
return 0;
}
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
| # | Function | File:Line |
|---|
| Variable | Value |
|---|
| Register | Value |
|---|
| Expression | Value |
|---|
| # | Description |
|---|