29#ifndef _GLIBCXX_TR1_CWCHAR
30#define _GLIBCXX_TR1_CWCHAR 1
32#pragma GCC system_header
38#ifdef _GLIBCXX_USE_WCHAR_T
40namespace std _GLIBCXX_VISIBILITY(default)
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
46#if _GLIBCXX_HAVE_WCSTOF
49#if _GLIBCXX_HAVE_VFWSCANF
52#if _GLIBCXX_HAVE_VSWSCANF
55#if _GLIBCXX_HAVE_VWSCANF
59#if _GLIBCXX_USE_C99_WCHAR
66_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.