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exception specification

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関数の宣言
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の歴史。インライン指定
例外仕様 (廃止予定)
noexcept指定子 (C++11)
例外
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Exceptions
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decltype specifier (C++11)
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インラインアセンブリ
 
関数が直接または間接的に投げることに例外を示し.
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Lists the exceptions that a function might directly or indirectly throw.
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目次

[編集] 構文

throw(typeid, typeid, ...) (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.
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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.
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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.
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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]

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()
}


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