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#include <iostream>
#include <vector>
#include <string>
#include <cstdint>
 
/**/
class UnicodeOne {
public:
	int Parse(const char8_t X[]) {
		C[0] = X[0];
		if ((X[0] & (1 << 7)) != 0) { return 1; }
		C[1] = X[1];
		C[2] = 0;
		if ((X[1] & (1 << 7)) != 0) { return 2; }
		C[2] = X[2];
		return 3;
	}
 
	std::size_t Size() {
		if (C[0] == 0 && C[1] != 0) { return 0; }
		if ((C[0] & (1 << 7)) != 0) { return 1; }
		if ((C[1] & (1 << 7)) != 0) { return 2; }
		return 3;
	}
 
	std::int8_t& operator [](std::size_t i) {
		return C[i];
	}
 
protected:
	std::int8_t C[3] = {};
};
	std::ostream& operator<<(std::ostream& OS,UnicodeOne C) {
 
		if ((C[1] & (1 << 7)) != 0) { C[2] = u8'\0'; }
 
		//const char8_t X[4] = { C[0],C[1],C[2],u8'\0' };
		const std::int8_t X[4] = { C[0],C[1],C[2],u8'\0' };
		OS << X;
		return OS;
	}
/**/
 
 
/**/
int main() {
	UnicodeOne UO;
 
	const char8_t A[] = u8"あ\0";
	const char8_t B[] = u8"え\0";
	char8_t C[] = u8"あ";
	UO.Parse(C);
	std::cout << UO <<":"<<A << std::endl;
 
	return 0;
}

prog.cpp:9:18: error: ‘char8_t’ does not name a type; did you mean ‘char16_t’?
  int Parse(const char8_t X[]) {
                  ^~~~~~~
                  char16_t
prog.cpp: In function ‘std::ostream& operator<<(std::ostream&, UnicodeOne)’:
prog.cpp:35:40: error: ‘u8’ was not declared in this scope
   if ((C[1] & (1 << 7)) != 0) { C[2] = u8'\0'; }
                                        ^~
prog.cpp:38:45: error: ‘u8’ was not declared in this scope
   const std::int8_t X[4] = { C[0],C[1],C[2],u8'\0' };
                                             ^~
prog.cpp:38:47: error: expected ‘}’ before '\x0'
   const std::int8_t X[4] = { C[0],C[1],C[2],u8'\0' };
                            ~                  ^~~~
prog.cpp:38:52: warning: no return statement in function returning non-void [-Wreturn-type]
   const std::int8_t X[4] = { C[0],C[1],C[2],u8'\0' };
                                                    ^
prog.cpp: At global scope:
prog.cpp:39:3: error: ‘OS’ does not name a type
   OS << X;
   ^~
prog.cpp:40:3: error: expected unqualified-id before ‘return’
   return OS;
   ^~~~~~
prog.cpp:41:2: error: expected declaration before ‘}’ token
  }
  ^

Standard output is empty