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#include <cassert>
#include <cuchar>
#include <string>
 
int main() {
    std::u32string u32 = U"this is a wide string";
    std::string narrow  = "this is a wide string";
    std::string converted(1000, '\0');
    char* ptr = &converted[0];
    std::mbstate_t state {};
    for(auto u : u32) {
        ptr += std::c32rtomb(ptr, u, &state);
    }
    converted.resize(ptr - &converted[0]);
    assert(converted == narrow);
}
 

prog.cpp:2:18: error: cuchar: No such file or directory
prog.cpp: In function ‘int main()’:
prog.cpp:6: error: ‘u32string’ is not a member of ‘std’
prog.cpp:6: error: expected `;' before ‘u32’
prog.cpp:10: error: a function-definition is not allowed here before ‘{’ token
prog.cpp:11: error: a function-definition is not allowed here before ‘:’ token
prog.cpp:14: error: could not convert ‘converted.std::basic_string<_CharT, _Traits, _Alloc>::resize [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](((unsigned int)(((int)ptr) - ((int)converted.std::basic_string<_CharT, _Traits, _Alloc>::operator[] [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](0u)))))’ to ‘bool’
prog.cpp:15: error: expected `)' before ‘;’ token

Standard output is empty