// N4606 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf 
#define msg "p341.cpp（163)13.5.8 User-defined literals [over.literal]"
// Edited by Dr. Ogawa Kiyoshi. Compile procedure and results record.

#include <iostream>

void operator "" _km(long double); // OK
std::string operator "" _i18n(const char*, std::size_t); // OK, ///add std:: to string
template <char...> double operator "" _\u03C0(); // OK: UCN for lowercase pi
float operator ""_e(const char*); // OK
float operator ""E(const char*); // error: reserved literal suffix (17.6.4.3.5, 2.13.8)
double operator""_Bq(long double); // OK: does not use the reserved identifier _Bq (2.10)
double operator"" _Bq(long double); // uses the reserved identifier _Bq (2.10)
float operator " " B(const char*); // error: non-empty string-literal
std::string operator "" 5X(const char*, std::size_t); //  ///add std:: to stringerror: invalid literal suffix identifier
double operator "" _miles(double); // error: invalid parameter-declaration-clause
template <char...> int operator "" _j(const char*); // error: invalid parameter-declaration-clause
extern "C" void operator "" _m(long double); // error: C language linkage


int main(){
  std::cout<< msg << std::endl;
  return EXIT_SUCCESS;
}

$ ./cppgl17.sh p341
$ clang++ p341.cpp
p341.cpp:12:18: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
float operator ""E(const char*); // error: reserved literal suffix (17.6.4.3.5, 2.13.8)
                 ^

p341.cpp:12:7: warning: user-defined literal suffixes not starting with '_' are reserved; no literal will invoke this operator
      [-Wuser-defined-literals]
float operator ""E(const char*); // error: reserved literal suffix (17.6.4.3.5, 2.13.8)
      ^
p341.cpp:15:16: error: string literal after 'operator' must be '""'
float operator " " B(const char*); // error: non-empty string-literal
               ^~~~~
               ""B
p341.cpp:15:7: warning: user-defined literal suffixes not starting with '_' are reserved; no literal will invoke this operator
      [-Wuser-defined-literals]
float operator " " B(const char*); // error: non-empty string-literal
      ^
p341.cpp:16:25: error: expected identifier
std::string operator "" 5X(const char*, std::size_t); // error: invalid literal suffix identifier
                        ^
p341.cpp:17:27: error: invalid literal operator parameter type 'double', did you mean 'long double'?
double operator "" _miles(double); // error: invalid parameter-declaration-clause
                          ^~~~~~
p341.cpp:18:24: error: literal operator template cannot have any parameters
template <char...> int operator "" _j(const char*); // error: invalid parameter-declaration-clause
                       ^
p341.cpp:19:17: error: literal operator must have C++ linkage
extern "C" void operator "" _m(long double); // error: C language linkage
                ^
p341.cpp:19:1: note: extern "C" language linkage specification begins here
extern "C" void operator "" _m(long double); // error: C language linkage
^
2 warnings and 6 errors generated.

$ g++-7 p341.cpp
p341.cpp:12:16: warning: literal operator suffixes not preceded by '_' are reserved for future standardization [-Wliteral-suffix]
 float operator ""E(const char*); // error: reserved literal suffix (17.6.4.3.5, 2.13.8)
                ^~~
p341.cpp:15:20: error: expected empty string after 'operator' keyword
 float operator " " B(const char*); // error: non-empty string-literal
                    ^
p341.cpp:16:22: error: expected suffix identifier
 std::string operator "" 5X(const char*, std::size_t); // error: invalid literal suffix identifier
                      ^~
p341.cpp:17:33: error: 'double operator""_miles(double)' has invalid argument list
 double operator "" _miles(double); // error: invalid parameter-declaration-clause
                                 ^
p341.cpp:18:50: error: 'int operator""_j(const char*)' has invalid argument list
 template <char...> int operator "" _j(const char*); // error: invalid parameter-declaration-clause
                                                  ^
p341.cpp:19:43: error: literal operator with C linkage
 extern "C" void operator "" _m(long double); // error: C language linkage
                                           ^