std::shared_ptr is a smart pointer from the C++ Standard Library that provides shared ownership of a dynamically allocated object. The toString() function is not a built-in function in the C++ Standard Library, but it can be implemented by overloading the operator<< for the std::shared_ptr class and returning a string representation of the object.
Code example:
```c++
#include
#include
#include
template
std::string toString(const std::shared_ptr& ptr) {
std::ostringstream oss;
oss << *ptr;
return oss.str();
}
class Foo {
public:
explicit Foo(int i) : i_(i) {}
friend std::ostream& operator<<(std::ostream& os, const Foo& foo) {
os << "Foo(" << foo.i_ << ")";
return os;
}
private:
int i_;
};
int main() {
std::shared_ptr ptr = std::make_shared(42);
std::cout << toString(ptr) << std::endl;
return 0;
}
```
This example defines a function called toString() that takes a std::shared_ptr as its argument and returns a string representation of the object. It uses the overloaded operator<< to print the object to a std::ostringstream and then returns the resulting string.
This code does not use any package library, but it relies on the C++ Standard Library.
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