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Difference between revisions of "cpp/io/basic ios"

From cppreference.com
< cpp‎ | io
m (r2.7.3) (Robot: Adding de, es, fr, it, ja, pt, ru, zh)
Line 5: Line 5:
 
     class CharT,  
 
     class CharT,  
 
     class Traits = std::char_traits<CharT>
 
     class Traits = std::char_traits<CharT>
−
> class basic_ios;
+
> class basic_ios : public ios_base
 
}}
 
}}
  

Revision as of 19:54, 16 April 2013

 
C++
 
Input/output library
 
std::basic_ios
 
Defined in header <ios>
template<

    class CharT,
    class Traits = std::char_traits<CharT>

> class basic_ios : public ios_base

The class basic_ios provides facilities for interfacing with objects that have basic_streambuf interface. Several basic_ios objects can refer to one actual basic_streambuf object. Character type dependent formatting flags and error state is stored in basic_ios class.

cpp/io/ios basestd-basic ios-inheritance.svg

Inheritance diagram

Two specializations for common character types are also provided:

Type Definition
ios basic_ios<char>
wios basic_ios<wchar_t>

Contents

Member types

Template:cpp/io/dcl list char typeTemplate:cpp/io/dcl list traits typeTemplate:cpp/io/dcl list int typeTemplate:cpp/io/dcl list pos typeTemplate:cpp/io/dcl list off type
Member type Definition

Public member functions

Template:cpp/io/basic ios/dcl list constructorTemplate:cpp/io/basic ios/dcl list destructorTemplate:cpp/io/basic ios/dcl list goodTemplate:cpp/io/basic ios/dcl list eofTemplate:cpp/io/basic ios/dcl list failTemplate:cpp/io/basic ios/dcl list badTemplate:cpp/io/basic ios/dcl list operator!Template:cpp/io/basic ios/dcl list operator boolTemplate:cpp/io/basic ios/dcl list rdstateTemplate:cpp/io/basic ios/dcl list setstateTemplate:cpp/io/basic ios/dcl list clearTemplate:cpp/io/basic ios/dcl list copyfmtTemplate:cpp/io/basic ios/dcl list fillTemplate:cpp/io/basic ios/dcl list exceptionsTemplate:cpp/io/basic ios/dcl list imbueTemplate:cpp/io/basic ios/dcl list rdbufTemplate:cpp/io/basic ios/dcl list tieTemplate:cpp/io/basic ios/dcl list narrowTemplate:cpp/io/basic ios/dcl list widen
operator=
 the copy assignment operator is deleted
(public member function)
State functions
Formatting
Miscellaneous

Protected member functions

Template:cpp/io/basic ios/dcl list initTemplate:cpp/io/basic ios/dcl list moveTemplate:cpp/io/basic ios/dcl list swapTemplate:cpp/io/basic ios/dcl list set rdbuf

Inherited from std::ios_base

Member functions

Formatting
manages format flags
(public member function of std::ios_base) [edit]
sets specific format flag
(public member function of std::ios_base) [edit]
clears specific format flag
(public member function of std::ios_base) [edit]
manages decimal precision of floating point operations
(public member function of std::ios_base) [edit]
manages field width
(public member function of std::ios_base) [edit]
Locales
sets locale
(public member function of std::ios_base) [edit]
returns current locale
(public member function of std::ios_base) [edit]
Internal extensible array
[static]
 returns a program-wide unique integer that is safe to use as index to pword() and iword()
(public static member function of std::ios_base) [edit]
resizes the private storage if necessary and access to the long element at the given index
(public member function of std::ios_base) [edit]
resizes the private storage if necessary and access to the void* element at the given index
(public member function of std::ios_base) [edit]
Miscellaneous
registers event callback function
(public member function of std::ios_base) [edit]
[static]
 sets whether C++ and C I/O libraries are interoperable
(public static member function of std::ios_base) [edit]
Member classes
stream exception
(public member class of std::ios_base) [edit]
initializes standard stream objects
(public member class of std::ios_base) [edit]

Member types and constants

Type Explanation
stream open mode type

The following constants are also defined:

Constant Explanation[edit]
app seek to the end of stream before each write[edit]
binary open in binary mode[edit]
in open for reading[edit]
out open for writing[edit]
trunc discard the contents of the stream when opening[edit]
ate seek to the end of stream immediately after open[edit]
noreplace (C++23) open in exclusive mode[edit]

(typedef) [edit]
formatting flags type

The following constants are also defined:

Constant Explanation[edit]
dec use decimal base for integer I/O: see std::dec[edit]
oct use octal base for integer I/O: see std::oct[edit]
hex use hexadecimal base for integer I/O: see std::hex[edit]
basefield dec | oct | hex. Useful for masking operations[edit]
left left adjustment (adds fill characters to the right): see std::left[edit]
right right adjustment (adds fill characters to the left): see std::right[edit]
internal internal adjustment (adds fill characters to the internal designated point): see std::internal[edit]
adjustfield left | right | internal. Useful for masking operations[edit]
scientific generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific[edit]
fixed generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed[edit]
floatfield scientific | fixed. Useful for masking operations[edit]
boolalpha insert and extract bool type in alphanumeric format: see std::boolalpha[edit]
showbase generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase[edit]
showpoint generate a decimal-point character unconditionally for floating-point number output: see std::showpoint[edit]
showpos generate a + character for non-negative numeric output: see std::showpos[edit]
skipws skip leading whitespace before certain input operations: see std::skipws[edit]
unitbuf flush the output after each output operation: see std::unitbuf[edit]
uppercase replace certain lowercase letters with their uppercase
equivalents in certain output operations: see std::uppercase[edit]

(typedef) [edit]
state of the stream type

The following constants are also defined:

Constant Explanation[edit]
goodbit no error[edit]
badbit irrecoverable stream error[edit]
failbit input/output operation failed (formatting or extraction error)[edit]
eofbit associated input sequence has reached end-of-file[edit]

(typedef) [edit]
seeking direction type

The following constants are also defined:

Constant Explanation[edit]
beg the beginning of a stream[edit]
end the ending of a stream[edit]
cur the current position of stream position indicator[edit]

(typedef) [edit]
specifies event type
(enum) [edit]
callback function type
(typedef) [edit]
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