std::mbsinit
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Text processing library
Regular expressions library (C++11)
Formatting library (C++20)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
(C++26)
Null-terminated multibyte strings
(C++11)(C++11)
Defined in header
<cwchar>
int mbsinit( const std::mbstate_t * ps);
If ps is not a null pointer, the mbsinit function determines whether the pointed-to std::mbstate_t object describes the initial conversion state.
Contents
[edit] Notes
Although a zero-initialized std::mbstate_t always represents the initial conversion state, there may be other values of std::mbstate_t that also represent the initial conversion state.
[edit] Parameters
ps
-
pointer to the std::mbstate_t object to examine
[edit] Return value
0 if ps is not a null pointer and does not represent the initial conversion state, nonzero value otherwise.
[edit] Example
Run this code
#include <clocale> #include <cwchar> #include <iostream> #include <string> int main() { // allow mbrlen() to work with UTF-8 multibyte encoding std::setlocale (LC_ALL, "en_US.utf8"); // UTF-8 narrow multibyte encoding std::string str = "水"; // or u8"\u6c34" or "\xe6\xb0\xb4" std::mbstate_t mb = std::mbstate_t (); (void)std::mbrlen (&str[0], 1, &mb); if (!std::mbsinit(&mb)) std::cout << "After processing the first 1 byte of " << str << " the conversion state is not initial\n"; (void)std::mbrlen (&str[1], str.size() - 1, &mb); if (std::mbsinit(&mb)) std::cout << "After processing the remaining 2 bytes of " << str << ", the conversion state is initial conversion state\n"; }
Output:
After processing the first 1 byte of 水 the conversion state is not initial After processing the remaining 2 bytes of 水, the conversion state is initial conversion state
[edit] See also
C documentation for mbsinit