Clang 3.3+ supports extended identifiers

ext_id.cpp

// clang++ hello.cpp
#include <iostream>

template <typename lhs_t, typename rhs_t>
inline int operator, (lhs_t lhs, rhs_t b) {
    std::cout << "飲冰室茶集" << std::endl;
    return 0;
}

template <typename lhs_t, typename rhs_t>
inline int operator^ (lhs_t lhs, rhs_t rhs) {
    std::cout << "--";
    return 0;
}

template <typename lhs_t, typename rhs_t>
inline int operator< (lhs_t lhs, rhs_t rhs) {
    std::cout << "以詩歌和春光佐茶";
    return 0;
}

enum{}整個城市都是我的, 咖啡館, _, y;

int main (void) {
  整個城市都是我的, 咖啡館^_<!!~y;
  return 0;
}