exception specification
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関数が直接または間接的に投げることに例外を示し.
Original:
Lists the exceptions that a function might directly or indirectly throw.
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目次 |
[編集] 構文
throw(typeid, typeid, ...)
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(廃止予定) | ||||||||
[編集] 説明
関数がその例外指定にリストされているタイプの
Tで宣言された場合、この関数はその型またはそれから派生した型の例外をスローすることがあります.Original:
If a function is declared with type
T listed in its exception specification, the function may throw exceptions of that type or a type derived from it.The text has been machine-translated via Google Translate.
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関数は例外仕様にリストされていない型の例外をスローした場合、関数std::unexpectedが呼び出されます。デフォルトの関数はstd::terminate呼び出しますが、それはstd::set_unexpected呼び出したり、例外をスローすることができるユーザー定義関数（std::terminate経由）で置き換えることができる。 std::unexpectedからスローされた例外は、例外指定に受け入れられた場合、スタック巻き戻しは通常通り継続される。それはありませんが、std::bad_exceptionは例外指定が許可されている場合、std::bad_exceptionがスローされます。それ以外の場合は、std::terminateが呼び出されます.
Original:
If the function throws an exception of the type not listed in its exception specification, the function std::unexpected is called. The default function calls std::terminate, but it may be replaced by a user-provided function (via std::set_unexpected) which may call std::terminate or throw an exception. If the exception thrown from std::unexpected is accepted by the exception specification, stack unwinding continues as usual. If it isn't, but std::bad_exception is allowed by the exception specification, std::bad_exception is thrown. Otherwise, std::terminate is called.
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[編集] 例
class X {}; class Y {}; class Z : public X {}; class W {}; void f() throw(X, Y) { int n = 0; if (n) throw X(); // OK if (n) throw Z(); // also OK throw W(); // will call std::unexpected() }
