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

0 vote137 views1 answer
C++ std::find with lambda
C++
0 vote126 views1 answer
Cin une énumération
C++
0 vote132 views1 answer
C++ abs template
C++
0 vote138 views1 answer
Split a number and store it in vector
C++
0 vote126 views1 answer
Getline vs cin.getline
C++
0 vote116 views1 answer
Ue4 set size of widget c++
C++
1 vote125 views1 answer
Qt qimage load from file
C++
6 votes126 views2 answers
Include pdf file in latex
C++
2 votes133 views1 answer
Print data type of a variable in c++
C++
0 vote120 views1 answer
How to check private messages on reddit
C++