Helper classes used to implement parameterized manipulators.
| Member Functions | |
| operator>>() operator<<() resetiosflag() setbase() setfill() setiosflag() |
setprecision() setw() |
#include <iomanip> template<class T> class smanip; template<class T, class traits> class smanip_fill;
The template classes smanip and smanip_fill are helper classes used to implement parameterized manipulators. The class smanip is used as the return type for manipulators that do not need to carry information about the character type of the stream they are applied to. This is the case for resetiosflags, setiosflags, setbase, setprecision, and setw. The class smanip_fill is used as the return type for manipulators that do need to carry information about the character type of the streamto which they are applied. This is the case for setfill.
smanip_fill is not described in the C++ standard, and is included as an extension.
template<class T>
class smanip {
public:
smanip(ios_base& (*pf) (ios_base&, T), T manarg);
};
template<class T, class traits>
class smanip_fill {
public:
smanip_fill(basic_ios<T, traits>& (*pf)
(basic_ios<T, traits>&, T), T manarg);
};
// parameterized manipulators
smanip<ios_base::fmtflags>
resetiosflag(ios_base::fmtflags mask);
smanip<ios_base::fmtflags>
setiosflag(ios_base::fmtflags mask);
smanip<int> setbase(int base);
smanip<int> setprecision(int n);
smanip<int> setw(int n);
template <class charT>
smanip_fill<charT, char_traits<charT> > setfill(charT c);
// overloaded extractors
template <class charT, class traits, class T>
basic_istream<charT,traits>&
operator>>(basic_istream<charT,traits>& is,
const smanip<T>& a);
template <class charT, class traits>
basic_istream<charT,traits>&
operator>>(basic_istream<charT,traits>& is,
const smanip_fill<charT,char_traits<charT> >& a);
// overloaded inserters
template <class charT, class traits, class T>
basic_ostream<charT,traits>&
operator<<(basic_ostream<charT,traits>& is,
const smanip<T>& a);
template <class charT, class traits>
basic_ostream<charT,traits>&
operator>>(basic_ostream<charT,traits>& is,
const smanip_fill<charT,char_traits<charT> >& a);
smanip(ios_base& (*pf) (ios_base&, T), T manarg);
Constructs an object of class smanip that stores a function pointer pf that is called with argument manarg, in order to perform the manipulator task. The call to pf is performed in the inserter or extractor overloaded on type smanip.
smanip_fill(basic_ios<T, traits>& (*pf) (basic_ios<T, traits>&, T), T manarg);
Constructs an object of class smanip_fill that stores a function pointer pf, that is called with argument manarg, in order to perform the manipulator task. The call to pf is performed in the inserter or extractor overloaded on type smanip_fill.
smanip<ios_base::fmtflags> resetiosflag(ios_base::fmtflags mask);
Resets the ios_base::fmtflags designated by mask in the stream to which it is applied.
smanip<int> setbase(int base);
Sets the base for the output or input of integer values in the stream to which it is applied. The valid values for mask are 8, 10, 16.
template <class charT> smanip_fill<charT, char_traits<charT> > setfill(charT c);
Sets the fill character in the stream to which it is applied.
smanip<ios_base::fmtflags> setiosflag(ios_base::fmtflags mask);
Sets the ios_base::fmtflags designated by mask in the stream to which it is applied.
smanip<int> setprecision(int n);
Sets the precision for the output of floating point values in the stream to which it is applied.
smanip<int> setw(int n);
Set the field width in the stream to which it is applied.
template <class charT, class traits, class T> basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>& is, const smanip<T>& a);
Applies the function stored in the parameter of type smanip<T>, on the stream is.
template <class charT, class traits>
basic_istream<charT,traits>&
operator>>(basic_istream<charT,traits>& is,
const smanip_fill<charT,char_traits<charT> >& a);
Applies the function stored in the parameter of type smanip_fill<charT, char_traits<charT> > on the stream is.
template <class charT, class traits, class T>
basic_ostream<charT,traits>&
operator<<(basic_ostream<charT,traits>& os,
const smanip<T>& a);
Applies the function stored in the parameter of type smanip<T> on the stream os.
template <class charT, class traits>
basic_ostream<charT,traits>&
operator<<(basic_ostream<charT,traits>& os,
const smanip_fill<charT,char_traits<charT> >& a);
Applies the function stored in the parameter of type smanip_fill<charT, char_traits<charT> > on the stream os.
ios_base(3C++), basic_ios(3C++), basic_istream(3C++), basic_ostream(3C++)
Working Paper for Draft Proposed International Standard for Information Systems--Programming Language C++, Section 27.6.3
ANSI X3J16/ISO WG21 Joint C++ Committee