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STLport-4.5.3
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_istream.h
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C/C++ Source or Header
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2001-05-03
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12KB
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345 lines
/*
* Copyright (c) 1999
* Silicon Graphics Computer Systems, Inc.
*
* Copyright (c) 1999
* Boris Fomitchev
*
* This material is provided "as is", with absolutely no warranty expressed
* or implied. Any use is at your own risk.
*
* Permission to use or copy this software for any purpose is hereby granted
* without fee, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
#ifndef _STLP_INTERNAL_ISTREAM_H
#define _STLP_INTERNAL_ISTREAM_H
// this block is included by _ostream.h, we include it here to lower #include level
# if defined (_STLP_HAS_WCHAR_T) && !defined (_STLP_CWCHAR)
# include <cwchar>
# endif
# ifndef _STLP_INTERNAL_IOS_H
# include <stl/_ios.h> // For basic_ios<>. Includes <iosfwd>.
# endif
#ifndef _STLP_INTERNAL_OSTREAM_H
# include <stl/_ostream.h> // Needed as a base class of basic_iostream.
#endif
#ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
# include <stl/_istreambuf_iterator.h>
#endif
#include <stl/_ctraits_fns.h> // Helper functions that allow char traits
// to be used as function objects.
_STLP_BEGIN_NAMESPACE
template <class _CharT, class _Traits, class _Number>
ios_base::iostate _STLP_CALL
_M_get_num(basic_istream<_CharT, _Traits>& __that, _Number& __val);
#if defined (_STLP_USE_TEMPLATE_EXPORT)
template <class _CharT, class _Traits>
class _Isentry;
#endif
struct _No_Skip_WS {}; // Dummy class used by sentry.
template <class _CharT, class _Traits>
bool _M_init_skip(basic_istream<_CharT, _Traits>& __is);
template <class _CharT, class _Traits>
bool _M_init_noskip(basic_istream<_CharT, _Traits>& __is);
//----------------------------------------------------------------------
// Class basic_istream, a class that performs formatted input through
// a stream buffer.
// The second template parameter, _Traits, defaults to char_traits<_CharT>.
// The default is declared in header <iosfwd>, and it isn't declared here
// because C++ language rules do not allow it to be declared twice.
template <class _CharT, class _Traits>
class basic_istream : virtual public basic_ios<_CharT, _Traits> {
public:
// Types
typedef _CharT char_type;
typedef typename _Traits::int_type int_type;
typedef typename _Traits::pos_type pos_type;
typedef typename _Traits::off_type off_type;
typedef _Traits traits_type;
typedef basic_ios<_CharT, _Traits> _Basic_ios;
typedef basic_istream<_CharT, _Traits> _Self;
typedef basic_ios<_CharT, _Traits>& (_STLP_CALL *__ios_fn)(basic_ios<_CharT, _Traits>&);
typedef ios_base& (_STLP_CALL *__ios_base_fn)(ios_base&);
typedef _Self& (_STLP_CALL *__istream_fn)(_Self&);
public: // Constructor and destructor.
explicit basic_istream(basic_streambuf<_CharT, _Traits>* __buf) :
basic_ios<_CharT, _Traits>(), _M_gcount(0) {
this->init(__buf);
}
~basic_istream() {};
public: // Nested sentry class.
public: // Hooks for manipulators. The arguments are
// function pointers.
_Self& operator>> (__istream_fn __f) { return __f(*this); }
_Self& operator>> (__ios_fn __f) { __f(*this); return *this; }
_Self& operator>> (__ios_base_fn __f) { __f(*this); return *this; }
public: // Formatted input of numbers.
_Self& operator>> (short& __val) {
long __lval;
unsigned short __uval;
_M_get_num(*this, __lval);
__val = __STATIC_CAST(short, __lval);
__uval = __lval;
// check if we lose digits
// if ((__val != __lval) && ((unsigned short)__val != __lval))
if ((__val != __lval) && ((long)__uval != __lval))
this->setstate(ios_base::failbit);
return *this;
}
_Self& operator>> (int& __val) {
long __lval;
unsigned int __uval;
_M_get_num(*this, __lval);
__val = __lval;
__uval = __lval;
// check if we lose digits
// if ((__val != __lval) && ((unsigned int)__val != __lval))
if ((__val != __lval) && ((long)__uval != __lval))
this->setstate(ios_base::failbit);
return *this;
}
_Self& operator>> (unsigned short& __val) { _M_get_num(*this, __val); return *this; }
_Self& operator>> (unsigned int& __val) { _M_get_num(*this, __val); return *this; }
_Self& operator>> (long& __val) { _M_get_num(*this, __val); return *this; }
_Self& operator>> (unsigned long& __val) { _M_get_num(*this, __val); return *this; }
#ifdef _STLP_LONG_LONG
_Self& operator>> (_STLP_LONG_LONG& __val) { _M_get_num(*this, __val); return *this; }
_Self& operator>> (unsigned _STLP_LONG_LONG& __val) { _M_get_num(*this, __val); return *this; }
#endif
_Self& operator>> (float& __val) { _M_get_num(*this, __val); return *this; }
_Self& operator>> (double& __val) { _M_get_num(*this, __val); return *this; }
# ifndef _STLP_NO_LONG_DOUBLE
_Self& operator>> (long double& __val) { _M_get_num(*this, __val); return *this; }
# endif
# ifndef _STLP_NO_BOOL
_Self& operator>> (bool& __val) { _M_get_num(*this, __val); return *this; }
# endif
_Self& operator>> (void*& __val) { _M_get_num(*this, __val); return *this; }
public: // Copying characters into a streambuf.
_Self& operator>>(basic_streambuf<_CharT, _Traits>*);
public: // Unformatted input.
streamsize gcount() const { return _M_gcount; }
int_type peek();
public: // get() for single characters
int_type get();
_Self& get(char_type& __c);
public: // get() for character arrays.
_Self& get(char_type* __s, streamsize __n, char_type __delim);
_Self& get(char_type* __s, streamsize __n)
{ return get(__s, __n, this->widen('\n')); }
public: // get() for streambufs
_Self& get(basic_streambuf<_CharT, _Traits>& __buf,
char_type __delim);
_Self& get(basic_streambuf<_CharT, _Traits>& __buf)
{ return get(__buf, this->widen('\n')); }
public: // getline()
_Self& getline(char_type* __s, streamsize __n, char_type delim);
_Self& getline(char_type* __s, streamsize __n)
{ return getline(__s, __n, this->widen('\n')); }
public: // read(), readsome(), ignore()
_Self& ignore();
_Self& ignore(streamsize __n);
#if (defined (_STLP_MSVC) && _STLP_MSVC < 1200)
inline
#endif
_Self& ignore(streamsize __n, int_type __delim);
_Self& read(char_type* __s, streamsize __n);
streamsize readsome(char_type* __s, streamsize __n);
public: // putback
_Self& putback(char_type __c);
_Self& unget();
public: // Positioning and buffer control.
int sync();
pos_type tellg();
_Self& seekg(pos_type __pos);
_Self& seekg(off_type, ios_base::seekdir);
public: // Helper functions for non-member extractors.
void _M_formatted_get(_CharT& __c);
void _M_formatted_get(_CharT* __s);
void _M_skip_whitespace(bool __set_failbit);
private: // Number of characters extracted by the
streamsize _M_gcount; // most recent unformatted input function.
public:
#if defined (_STLP_USE_TEMPLATE_EXPORT)
// If we are using DLL specs, we have not to use inner classes
// end class declaration here
typedef _Isentry<_CharT, _Traits> sentry;
};
# define sentry _Isentry
template <class _CharT, class _Traits>
class _Isentry {
typedef _Isentry<_CharT, _Traits> _Self;
# else
class sentry {
typedef sentry _Self;
#endif
private:
const bool _M_ok;
// basic_streambuf<_CharT, _Traits>* _M_buf;
public:
typedef _Traits traits_type;
explicit sentry(basic_istream<_CharT, _Traits>& __is,
bool __noskipws = false) :
_M_ok((__noskipws || !(__is.flags() & ios_base::skipws)) ? _M_init_noskip(__is) : _M_init_skip(__is) )
/* , _M_buf(__is.rdbuf()) */
{}
// Calling this constructor is the same as calling the previous one with
// __noskipws = true, except that it doesn't require a runtime test.
sentry(basic_istream<_CharT, _Traits>& __is, _No_Skip_WS) : /* _M_buf(__is.rdbuf()), */
_M_ok(_M_init_noskip(__is)) {}
~sentry() {}
operator bool() const { return _M_ok; }
private: // Disable assignment and copy constructor.
sentry(const _Self&) : _M_ok(false) {}
void operator=(const _Self&) {}
};
# if defined (_STLP_USE_TEMPLATE_EXPORT)
# undef sentry
# else
// close basic_istream class definition here
};
# endif
# if defined (_STLP_USE_TEMPLATE_EXPORT)
_STLP_EXPORT_TEMPLATE_CLASS _Isentry<char, char_traits<char> >;
_STLP_EXPORT_TEMPLATE_CLASS basic_istream<char, char_traits<char> >;
# if ! defined (_STLP_NO_WCHAR_T)
_STLP_EXPORT_TEMPLATE_CLASS _Isentry<wchar_t, char_traits<wchar_t> >;
_STLP_EXPORT_TEMPLATE_CLASS basic_istream<wchar_t, char_traits<wchar_t> >;
# endif
# endif /* _STLP_USE_TEMPLATE_EXPORT */
// Non-member character and string extractor functions.
template <class _CharT, class _Traits>
inline basic_istream<_CharT, _Traits>& _STLP_CALL
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c) {
__in._M_formatted_get(__c);
return __in;
}
template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL
operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c) {
__in._M_formatted_get(__REINTERPRET_CAST(char&,__c));
return __in;
}
template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL
operator>>(basic_istream<char, _Traits>& __in, signed char& __c) {
__in._M_formatted_get(__REINTERPRET_CAST(char&,__c));
return __in;
}
template <class _CharT, class _Traits>
inline basic_istream<_CharT, _Traits>& _STLP_CALL
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s) {
__in._M_formatted_get(__s);
return __in;
}
template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL
operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s) {
__in._M_formatted_get(__REINTERPRET_CAST(char*,__s));
return __in;
}
template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL
operator>>(basic_istream<char, _Traits>& __in, signed char* __s) {
__in._M_formatted_get(__REINTERPRET_CAST(char*,__s));
return __in;
}
//----------------------------------------------------------------------
// istream manipulator.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& _STLP_CALL
ws(basic_istream<_CharT, _Traits>& __is);
//----------------------------------------------------------------------
// Class iostream.
template <class _CharT, class _Traits>
class basic_iostream
: public basic_istream<_CharT, _Traits>,
public basic_ostream<_CharT, _Traits>
{
public:
typedef basic_ios<_CharT, _Traits> _Basic_ios;
explicit basic_iostream(basic_streambuf<_CharT, _Traits>* __buf);
virtual ~basic_iostream();
};
# if defined (_STLP_USE_TEMPLATE_EXPORT)
_STLP_EXPORT_TEMPLATE_CLASS basic_iostream<char, char_traits<char> >;
# if ! defined (_STLP_NO_WCHAR_T)
_STLP_EXPORT_TEMPLATE_CLASS basic_iostream<wchar_t, char_traits<wchar_t> >;
# endif
# endif /* _STLP_USE_TEMPLATE_EXPORT */
template <class _CharT, class _Traits>
basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& __is)
{
return __is.rdbuf();
}
_STLP_END_NAMESPACE
# if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) && !defined (_STLP_LINK_TIME_INSTANTIATION)
# include <stl/_istream.c>
# endif
#endif /* _STLP_INTERNAL_ISTREAM_H */
// Local Variables:
// mode:C++
// End: