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std::is_error_code_enum<std::io_errc>

提供: cppreference.com
< cpp‎ | io‎ | io errc

 
 
入力/出力ライブラリ
I / Oのマニピュレータ
CスタイルのI / O
バッファ
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(廃止予定)
ストリーム
Original:
Streams
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抽象化
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
ファイルI / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
文字列I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
アレイのI / O
Original:
Array I/O
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istrstream(廃止予定)
ostrstream(廃止予定)
strstream(廃止予定)
タイプ
Original:
Types
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streamoff
streamsize
fpos
エラーカテゴリインターフェース
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::io_errc
ヘルパークラス
Original:
Helper classes
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is_error_code_enum<std::io_errc>
ヘルパー関数
Original:
Helper functions
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make_error_code(std::io_errc)
make_error_condition(std::io_errc)
 
Defined in header <ios>
template< >
struct is_error_code_enum<std::io_errc> : public std::true_type { };
(C + + 11以来)
std::is_error_code_enumのこの分業型の値std::io_errc型のオブジェクトにそれらを暗黙的に変換してアサイン可能になりエラーコードを保持する列挙型であることを他のライブラリ·コンポーネントに通知std::error_code.
Original:
This specialization of std::is_error_code_enum informs other library components that values of type std::io_errc are enumerations that hold error codes, which makes them implicitly convertible and assignable to objects of type std::error_code.
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目次

Inherited from std::integral_constant

Member constants

value
[静的]
true
(公共の静的メンバ定数)

Member functions

operator bool
boolにオブジェクトは、value返しに変換します
Original:
converts the object to bool, returns value
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(パブリックメンバ関数)

Member types

タイプ
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[編集]

e.code()のでstd::io_errc::streamstd::is_error_code_enum<std::io_errc>::value == true間の比較がコンパイルされます
Original:
The comparison between e.code() and std::io_errc::stream compiles because std::is_error_code_enum<std::io_errc>::value == true
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#include <iostream>
#include <fstream>
int main()
{
    std::ifstream f("doesn't exist");
    try {
        f.exceptions(f.failbit);
    } catch (const std::ios_base::failure& e) {
        std::cout << "Caught an ios_base::failure.\n";
        if(e.code() == std::io_errc::stream)
            std::cout << "The error code is std::io_errc::stream\n";
    }
}

Output:

Caught an ios_base::failure.
The error code is std::io_errc::stream

[編集] も参照してください

ERROR_CODEとしてクラスを識別列挙
Original:
identifies a class as an error_code enumeration
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(クラステンプレート) [edit]
プラットフォーム依存のエラーコードを取得しています
Original:
holds a platform-dependent error code
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(クラス) [edit]
(C++11)
IOストリーム·エラー·コード
Original:
the IO stream error codes
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(列挙) [edit]