std::ostreambuf_iterator<CharT,Traits>:: failed

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< cpp ‎ | iterator ‎ | ostreambuf iterator

indirectly_readable (C++20)
indirectly_writable (C++20)
weakly_incrementable (C++20)
incrementable (C++20)
is-integer-like is-signed-integer-like (C++20) (C++20)

sentinel_for (C++20)
sized_sentinel_for (C++20)
input_iterator (C++20)
output_iterator (C++20)
input_or_output_iterator (C++20)

forward_iterator (C++20)
bidirectional_iterator (C++20)
random_access_iterator (C++20)
contiguous_iterator (C++20)

Iterator primitives

input_iterator_tag output_iterator_tag forward_iterator_tag bidirectional_iterator_tag random_access_iterator_tag contiguous_iterator_tag

(C++20)

iter_value_t iter_difference_t iter_reference_t iter_const_reference_t iter_rvalue_reference_t iter_common_reference_t

(C++20) (C++20) (C++20) (C++23) (C++20) (C++20)

iterator (deprecated in C++17)
iterator_traits
incrementable_traits (C++20)
indirectly_readable_traits (C++20)

Algorithm concepts and utilities

Indirect callable concepts

indirectly_unary_invocable indirectly_regular_unary_invocable

(C++20) (C++20)

indirect_unary_predicate (C++20)
indirect_binary_predicate (C++20)

indirect_equivalence_relation (C++20)
indirect_strict_weak_order (C++20)

Common algorithm requirements

indirectly_movable (C++20)
indirectly_movable_storable (C++20)
indirectly_copyable (C++20)

indirectly_copyable_storable (C++20)
indirectly_swappable (C++20)
indirectly_comparable (C++20)

permutable (C++20)
mergeable (C++20)
sortable (C++20)

Utilities

indirect_result_t

(C++20)

projected

(C++20)

projected_value_t

(C++26)

Iterator adaptors

reverse_iterator
make_reverse_iterator (C++14)
move_iterator (C++11)
make_move_iterator (C++11)
default_sentinel_t default_sentinel (C++20) (C++20)
unreachable_sentinel_t unreachable_sentinel (C++20) (C++20)

front_insert_iterator
back_insert_iterator
inserter
insert_iterator
front_inserter
back_inserter
move_sentinel (C++20)

common_iterator (C++20)
counted_iterator (C++20)
basic_const_iterator (C++23)
const_iterator (C++23)
const_sentinel (C++23)
make_const_iterator (C++23)
make_const_sentinel (C++23)

Stream iterators

istream_iterator
ostream_iterator

istreambuf_iterator
ostreambuf_iterator

Iterator customization points
ranges::iter_move (C++20)
ranges::iter_swap (C++20)

Iterator operations

advance
distance
prev (C++11)
next (C++11)

ranges::advance (C++20)
ranges::distance (C++20)
ranges::prev (C++20)
ranges::next (C++20)

Range access

begin cbegin (C++11) (C++14)
rbegin crbegin (C++14) (C++14)

end cend (C++11) (C++14)
rend crend (C++14) (C++14)

size ssize (C++17) (C++20)
empty (C++17)
data (C++17)

bool failed ( ) const throw ( ) ;		(C++11 前)
bool failed ( ) const noexcept ;		(C++11 起)

当迭代器遇到文件结束条件时返回 true ，即先前调用 std::basic_streambuf::sputc （通过 operator= 执行）返回了 Traits :: eof 的情况。

参数

(无)

返回值

true 表示该迭代器在输出时遇到文件结束条件， false 表示其他情况。

示例

本节内容不完整
原因：缺少示例

Compiler support
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Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Diagnostics library
Memory management library
Metaprogramming library (C++11)
General utilities library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Strings library
Text processing library
Numerics library
Date and time library
Input/output library
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Technical specifications
Symbols index
External libraries

Member functions
ostreambuf_iterator::ostreambuf_iterator
ostreambuf_iterator::operator=
ostreambuf_iterator::operator*
ostreambuf_iterator::operator++ ostreambuf_iterator::operator++(int)
ostreambuf_iterator::failed

cppreference.net

Namespaces

Variants

std::ostreambuf_iterator<CharT,Traits>:: failed

参数

返回值

示例