How to Efficiently Convert a C String (or char array) to a wstring (or wchar_t array)?

C Convert string (or char) to wstring (or wchar_t)

Question:

Given a string s represented as an array of characters and a wstring ws, how do you efficiently convert the contents of s to ws without distorting the original content?

Answer:

To address this issue, the standard library (C 11 ) provides comprehensive support for converting between different character encodings, including UTF-8 and UTF-16. Here's a robust solution using the standard library:

#include <locale>
#include <codecvt>
#include <string>

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
// Convert string to wstring
std::wstring ws = converter.from_bytes(s);

Additional Notes:

• The codecvt_utf8_utf16 converter handles the conversion between UTF-8 (used in the input string s) and UTF-16 (used in the output wstring ws).
• The wstring_convert class provides a convenient and efficient way to perform these conversions.
• In C 17 and later, the codecvt header has been deprecated in favor of the std::charconv library. However, the solution presented here should continue to work for the foreseeable future.

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