code. compile. run. debug. share.
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/******************************************************************************
Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
*******************************************************************************/
#include <iostream>
using namespace std;
template <typename T>
class WrapperPtr
{
T * ptr;
public:
WrapperPtr(const WrapperPtr&){
// ???
}
WrapperPtr(WrapperPtr&&) {
// ???
}
WrapperPtr(const T & other)
: ptr(new T(other)) {}
WrapperPtr(T * other)
: ptr(other) {}
~WrapperPtr()
{
// ????
delete ptr;
}
T * operator -> () { return ptr; }
T & operator * () { return *ptr; }
const T & operator * () const { return *ptr; }
bool operator == (T other) const { other == *ptr; }
operator T () { return *ptr; }
};
class X
{
int x;
public:
X(int x) : x(x) {}
void foo () { std::cout << "X::foo();\n"; }
int bar (std::string s) { std::cout << "X::bar(" << s << ");\n"; }
};
// an example templated functio
template <typename T>
bool my_is_same(const T& t1, const T& t2) { return t1 == t2;}
// second invocation fails due to template substitution failure
bool problem() {
WrapperPtr<int> w(5);
return my_is_same(static_cast<int>(w), 5) && my_is_same(*w, 5);
}
int main()
{
WrapperPtr<X> w(new X(5));
w->foo();
w->bar("hello");
return 0;
}
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