C++ shared pointer operator bool

#include <iostream>
#include <memory>
 
void report(std::shared_ptr<int> ptr) {
    if (ptr) {
        std::cout << "*ptr=" << *ptr << "\n";
    } else {
        std::cout << "ptr is not a valid pointer.\n";
    }
}
 
int main() {
    std::shared_ptr<int> ptr;
    report(ptr);
 
    ptr = std::make_shared<int>(7);
    report(ptr);
}
//output:
//ptr is not a valid pointer.
//*ptr=7

Source: en.cppreference.com

Similar codes

1 vote276 views1 answer
Chrono start time in c++
C++
8 votes346 views10 answers
Javascript loop array
C++
26 votes279 views10 answers
Bootstrap
C++
2 votes273 views1 answer
Gcc run c++
C++
29 votes261 views6 answers
String to int in c++
C++
1 vote270 views1 answer
Lower bound c++
C++
0 vote269 views1 answer
Varint index
C++
8 votes270 views2 answers
‘setprecision’ was not declared in this scope
C++
0 vote280 views1 answer
Apertura file in c++
C++
0 vote271 views2 answers
Opencv combine video
C++