How to input a std::string_view in C++?

Question

This is the normal way to input(kinda) a std::string_view variable :

#include <bits/stdc++.h>
using namespace std;
int main()
{
    string str; // Still have to use std::string class // Resulting in stack/heap allocation
    getline(cin, str);

    string_view view(str);

    return 0;
}

I was wondering is there any way at all to directly input a std::string_view without having to use the string class (using heap allocation) ???

[ I definitely know that a string literal ( like "Hello") is stored directly in the binary code at compile time without causing any stack/heap allocation ... so maybe any way to directly input the string literal into the string_view ??? ]

Note : I want a user input NOT a hard coded string in the code !

Nope. You cannot allow a program to store an arbitrary amount of input data without some additional allocation, and std::string_view does not allocate any additional data by design. Your code is correctly written. — alter_igel
– alter_igel, Commented Mar 1, 2021 at 3:23
string_view doesn't have its own storage - it's a view onto storage provided by some other object. But the user input needs to be stored somewhere — Igor Tandetnik
– Igor Tandetnik, Commented Mar 1, 2021 at 3:23

eerorika · Accepted Answer · 2021-03-01 03:24:05Z

7

No, there is no way to read input into a string view.

If you want to input a string, you have to store it somewhere. It doesn't necessarily have to be std::string, but that is the simplest option.

answered Mar 1, 2021 at 3:24

eerorika

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