How Can I Embed Null Characters in a C std::string?

Incorporating Embedded Nulls in std::string: A Comprehensive Guide

If you desire to create a std::string containing an embedded null character, you must tackle various syntax nuances depending on the C version you employ.

C 14 and Beyond: Introducing String Literals

C 14 introduced string literals, providing a convenient method for constructing std::strings with embedded nulls:

#include <iostream>
#include <string>

using namespace std::string_literals;

int main() {
    std::string s = "pl-<pre class="brush:php;toolbar:false">std::string x("pqrs");   // Two characters, as input is interpreted as a C-string
std::string x("pqrs", 5); // 5 Characters, as input is now a char array with 5 characters

-op"s; // Notice the "s" at the end, indicating a std::string literal std::cout << s << "\n"; }

Pre-C 14: Using Character Arrays

Before C 14, the std::string constructor expecting a const char* assumed C-strings, which are null-terminated. To overcome this, you must use the constructor that takes a char array and a length:

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Key Points

• std::strings are not null-terminated, but you can obtain a C-string pointer with the c_str() method.
• Doug T's answer suggests using a vector<char> as an alternative approach.

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