exception specification
来自cppreference.com
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列出的功能的异常可能直接或间接地扔.
Original:
Lists the exceptions that a function might directly or indirectly throw.
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目录 |
[编辑] 语法
throw(typeid, typeid, ...)
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[编辑] 解释
如果一个函数被声明为与它的异常规范中列出的
T类型，函数可能抛出异常，该类型或从它派生的类型.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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如果函数抛出一个异常，它的异常规范中未列出的类型，功能std::unexpected被调用。默认的函数调用std::terminate，但它可能会被替换由用户提供的功能（通过std::set_unexpected），可致电std::terminate或者抛出一个异常。如果所接受的异常规范，从std::unexpected抛出的异常堆栈平仓像往常一样继续。如果不是这样，但std::bad_exception所允许的异常规范，std::bad_exception被抛出。否则，std::terminate被称为.
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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[编辑] 为例
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() }
