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C++17 in Detail: A Deep Dive

Printing With printf()

This is a third party API which may cause problems with std::string_view. We'll learn how to use them together correctly.

We'll cover the following...

For example:

C++ 17
#include <iostream>
using namespace std;
int main() {
  std::string s = "Hello World";
  std::string_view sv = s;
  std::string_view sv2 = sv.substr(0, 5);
  printf("My String %s", sv2.data()); // oops?
}

Instead you should use:

printf("%.*s\n", static_cast<int>(sv2.size()),
...