std::basic_ios::fail
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| bool fail() const; |
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戻りtrueエラーが関連付けられているストリームで発生した場合。具体的には、戻りtrue場合
badbitまたはfailbitrdstate()に設定されています. Original:
Returns true if an error has occurred on the associated stream. Specifically, returns true if
badbit or failbit is set in rdstate(). The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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| This section is incomplete Reason: difference between fail() and good() |
目次 |
[編集] パラメータ
(なし)
Original:
(none)
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[編集] 値を返します
trueエラーが発生した場合、falseその他のとき.
Original:
true if an error has occurred, false otherwise.
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[編集] 例
#include <iostream> #include <fstream> #include <cstdlib> int main() { std::ifstream file("test.txt"); if(!file) // operator! is used here { std::cout << "File opening failed\n"; return EXIT_FAILURE; } // typical C++ I/O loop uses the return value of the I/O function // as the loop controlling condition, operator bool() is used here for(int n; file >> n; ) { std::cout << n << ' '; } std::cout << '\n'; if (file.bad()) std::cout << "I/O error while reading\n"; else if (file.eof()) std::cout << "End of file reached successfully\n"; else if (file.fail()) std::cout << "Non-integer data encountered\n"; }
[編集] も参照してください
| ios_base::iostate flags | basic_ios accessors | |||||||
| eofbit | failbit | badbit | good() | fail() | bad() | eof() | operator bool() | operator!() |
| false | false | false | true | false | false | false | true | false |
| false | false | true | false | true | true | false | false | true |
| false | true | false | false | true | false | false | false | true |
| false | true | true | false | true | true | false | false | true |
| true | false | false | false | false | false | true | true | false |
| true | false | true | false | true | true | true | false | true |
| true | true | false | false | true | false | true | false | true |
| true | true | true | false | true | true | true | false | true |
| ファイルのエラーをチェックします Original: checks for a file error The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (機能) | |