运行 ID: 39375

Main.cc:11:1: error: ‘C’ does not name a type
 C++: 
 ^
In file included from /usr/include/c++/7/iosfwd:40:0,
                 from /usr/include/c++/7/ios:38,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/bits/postypes.h:98:11: error: ‘ptrdiff_t’ does not name a type
   typedef ptrdiff_t streamsize; // Signed integral type
           ^~~~~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:120:31: error: declaration of ‘operator new’ as non-function
 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
                               ^
/usr/include/c++/7/new:120:25: error: ‘size_t’ is not a member of ‘std’
 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
                         ^~~~~~
/usr/include/c++/7/new:120:25: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:122:33: error: declaration of ‘operator new []’ as non-function
 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
                                 ^
/usr/include/c++/7/new:122:27: error: ‘size_t’ is not a member of ‘std’
 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
                           ^~~~~~
/usr/include/c++/7/new:122:27: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:134:25: error: declaration of ‘operator new’ as non-function
 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
                         ^~~~~~
/usr/include/c++/7/new:134:25: error: ‘size_t’ is not a member of ‘std’
/usr/include/c++/7/new:134:25: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:134:33: error: expected primary-expression before ‘const’
 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
                                 ^~~~~
/usr/include/c++/7/new:136:27: error: declaration of ‘operator new []’ as non-function
 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
                           ^~~~~~
/usr/include/c++/7/new:136:27: error: ‘size_t’ is not a member of ‘std’
/usr/include/c++/7/new:136:27: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:136:35: error: expected primary-expression before ‘const’
 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
                                   ^~~~~
/usr/include/c++/7/new:168:32: error: declaration of ‘operator new’ as non-function
 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
                                ^~~~~~
/usr/include/c++/7/new:168:32: error: ‘size_t’ is not a member of ‘std’
/usr/include/c++/7/new:168:32: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:168:40: error: expected primary-expression before ‘void’
 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
                                        ^~~~
/usr/include/c++/7/new:170:34: error: declaration of ‘operator new []’ as non-function
 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
                                  ^~~~~~
/usr/include/c++/7/new:170:34: error: ‘size_t’ is not a member of ‘std’
/usr/include/c++/7/new:170:34: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/exception_ptr.h:40:0,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/new:170:42: error: expected primary-expression before ‘void’
 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
                                          ^~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:362:31: error: ‘std::size_t’ has not been declared
   template
                               ^~~~~~
/usr/include/c++/7/type_traits:363:25: error: ‘_Size’ was not declared in this scope
     struct is_array<_Tp[_Size]>
                         ^~~~~
/usr/include/c++/7/type_traits:363:31: error: template argument 1 is invalid
     struct is_array<_Tp[_Size]>
                               ^
/usr/include/c++/7/type_traits:561:42: error: ‘nullptr_t’ is not a member of ‘std’
     struct __is_null_pointer_helper
                                          ^~~~~~~~~
/usr/include/c++/7/type_traits:561:42: note: suggested alternative:
In file included from /usr/include/c++/7/bits/cxxabi_init_exception.h:38:0,
                 from /usr/include/c++/7/bits/exception_ptr.h:38,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:444:29: note:   ‘nullptr_t’
   typedef decltype(nullptr) nullptr_t;
                             ^~~~~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:561:42: error: ‘nullptr_t’ is not a member of ‘std’
     struct __is_null_pointer_helper
                                          ^~~~~~~~~
/usr/include/c++/7/type_traits:561:42: note: suggested alternative:
In file included from /usr/include/c++/7/bits/cxxabi_init_exception.h:38:0,
                 from /usr/include/c++/7/bits/exception_ptr.h:38,
                 from /usr/include/c++/7/exception:142,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:444:29: note:   ‘nullptr_t’
   typedef decltype(nullptr) nullptr_t;
                             ^~~~~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:561:51: error: template argument 1 is invalid
     struct __is_null_pointer_helper
                                                   ^
/usr/include/c++/7/type_traits:1464:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1464:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1464:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1464:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1464:61: error: template argument 1 is invalid
     : public integral_constant { };
                                                             ^
/usr/include/c++/7/type_traits:1464:61: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1469:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1469:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1469:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1469:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1469:46: error: template argument 1 is invalid
     : public integral_constant { };
                                              ^
/usr/include/c++/7/type_traits:1469:46: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1471:31: error: ‘std::size_t’ has not been declared
   template
                               ^~~~~~
/usr/include/c++/7/type_traits:1472:21: error: ‘_Size’ was not declared in this scope
     struct rank<_Tp[_Size]>
                     ^~~~~
/usr/include/c++/7/type_traits:1472:27: error: template argument 1 is invalid
     struct rank<_Tp[_Size]>
                           ^
/usr/include/c++/7/type_traits:1473:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value> { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1473:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1473:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value> { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1473:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1473:65: error: template argument 1 is invalid
     : public integral_constant::value> { };
                                                                 ^
/usr/include/c++/7/type_traits:1473:65: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1477:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value> { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1477:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1477:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value> { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1477:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1477:65: error: template argument 1 is invalid
     : public integral_constant::value> { };
                                                                 ^
/usr/include/c++/7/type_traits:1477:65: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1482:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1482:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1482:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant { };
                                     ^~~~~~
/usr/include/c++/7/type_traits:1482:37: note: suggested alternative:
In file included from /usr/include/stdio.h:33:0,
                 from Main.cc:1:
/usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h:216:23: note:   ‘size_t’
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/nested_exception.h:40,
                 from /usr/include/c++/7/exception:143,
                 from /usr/include/c++/7/ios:39,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/type_traits:1482:46: error: template argument 1 is invalid
     : public integral_constant { };
                                              ^
/usr/include/c++/7/type_traits:1482:46: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1484:47: error: ‘std::size_t’ has not been declared
   template
                                               ^~~~~~
/usr/include/c++/7/type_traits:1485:23: error: ‘_Size’ was not declared in this scope
     struct extent<_Tp[_Size], _Uint>
                       ^~~~~
/usr/include/c++/7/type_traits:1485:36: error: template argument 1 is invalid
     struct extent<_Tp[_Size], _Uint>
                                    ^
/usr/include/c++/7/type_traits:1486:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value>
                            ^
/usr/include/c++/7/type_traits:1488:28: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1493:37: error: ‘size_t’ is not a member of ‘std’
     : public integral_constant::value>
                               ^
/usr/include/c++/7/type_traits:1495:31: note: invalid template non-type parameter
/usr/include/c++/7/type_traits:1944:31: error: ‘std::size_t’ has not been declared
   template
                               ^~~~~~
/usr/include/c++/7/type_traits:1945:30: error: ‘_Size’ was not declared in this scope
     struct remove_extent<_Tp[_Size]>
                              ^~~~~
/usr/include/c++/7/type_traits:1945:36: error: template argument 1 is invalid
     struct remove_extent<_Tp[_Size]>
                                    ^
/usr/include/c++/7/type_traits:1957:31: error: ‘std::size_t’ has not been declared
   template
                               ^~~~~~
/usr/include/c++/7/type_traits:1958:35: error: ‘_Size’ was not declared in this scope
     struct remove_all_extents<_Tp[_Size]>
                                   ^~~~~
/usr/include/c++/7/type_traits:1958:41: error: template argument 1 is invalid
     struct remove_all_extents<_Tp[_Size]>
                                         ^
/usr/include/c++/7/type_traits:2016:17: error: ‘std::size_t’ has not been declared
   template
                 ^~~~~~
/usr/include/c++/7/type_traits:2021:23: error: ‘_Len’ was not declared in this scope
  unsigned char __data[_Len];
                       ^~~~
/usr/include/c++/7/type_traits:2036:17: error: ‘std::size_t’ has not been declared
   template::__type)>
                                                ^~~~
/usr/include/c++/7/type_traits:2037:52: error: template argument 1 is invalid
     __alignof__(typename __aligned_storage_msa<_Len>::__type)>
                                                    ^
/usr/include/c++/7/type_traits:2042:23: error: ‘_Len’ was not declared in this scope
  unsigned char __data[_Len];
                       ^~~~
/usr/include/c++/7/type_traits:2043:37: error: ‘_Align’ was not declared in this scope
  struct __attribute__((__aligned__((_Align)))) { } __align;
                                     ^~~~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:62:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/ext/type_traits.h:162:35: error: ‘bool __gnu_cxx::__is_null_pointer’ redeclared as different kind of symbol
   __is_null_pointer(std::nullptr_t)
                                   ^
/usr/include/c++/7/ext/type_traits.h:157:5: note: previous declaration ‘template bool __gnu_cxx::__is_null_pointer(_Type)’
     __is_null_pointer(_Type)
     ^~~~~~~~~~~~~~~~~
/usr/include/c++/7/ext/type_traits.h:162:26: error: ‘nullptr_t’ is not a member of ‘std’
   __is_null_pointer(std::nullptr_t)
                          ^~~~~~~~~
/usr/include/c++/7/ext/type_traits.h:162:26: note: suggested alternative: ‘__is_nullptr_t’
   __is_null_pointer(std::nullptr_t)
                          ^~~~~~~~~
                          __is_nullptr_t
In file included from /usr/include/c++/7/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:13:
/usr/include/c++/7/bits/stl_pair.h:86:17: error: ‘std::size_t’ has not been declared
   template
                 ^~~~~~
/usr/include/c++/7/bits/stl_pair.h:434:41: error: ‘std::size_t’ has not been declared
       template
                                         ^~~~~~
/usr/include/c++/7/bits/stl_pair.h:437:27: error: ‘_Indexes1’ was not declared in this scope
              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
                           ^~~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:437:27: note: suggested alternative: ‘_Index_tuple’