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C++17 in Detail: A Deep Dive

Conversion Functions Like atoi()/atof()

This lesson explains why conversion using atof() is not possible with string_view.

We'll cover the following...
C++ 17
#include <iostream>
using namespace std;
int main() {
  std::string number = "123.456";
  std::string_view svNum { number.data(), 3 };
  auto f = atof(svNum.data()); // should be 123, but is 123.456! 
  std::cout << f << '\n';
}

atof takes only the pointer to a null-terminated string, so ...