std :: copy_exception在哪里定义? [英] Where is std::copy_exception defined?
问题描述
安东尼·威廉姆斯(Anthony Williams)在中 C ++并发行动 4.2.4保存未来的例外可以直接存储异常,而不会使用 std :: copy_exception
抛出异常。但是,我似乎无法找到标准库头,其中定义了 std :: copy_exception
。我在哪里可以找到?
The book C++ Concurrency in Action by Anthony Williams states in 4.2.4 Saving an exception for the future that it is possible to store an exception directly without throwing using std::copy_exception
. However I seem to be unable to find the standard library header where std::copy_exception
is defined. Where can I find it?
推荐答案
tl; dr : std: :copy_exception
已重命名为 std :: make_exception_ptr
在< exception>
中为最终C ++ 11标准。
tl;dr: std::copy_exception
was renamed to std::make_exception_ptr
in <exception>
for the final C++11 standard.
委员会决定将名称 copy_exception
(可能复制到 boost :: copy_exception
)由于以下原因导致误导。
The committee decided that the name copy_exception
(probably copied into the standard from boost::copy_exception
) was misleading for the following reasons.
copy_exception
函数返回一个 exception_ptr
到其参数的副本,如同
The copy_exception
function returns an exception_ptr
to a copy of its argument, as if
template <class E>
exception_ptr copy_exception(E e) {
try {
throw e;
} catch (...) {
return current_exception();
}
}
使用 exception_ptr
作为参数,该函数将返回另一个 exception_ptr
,指向给定的 exception_ptr
的副本作为参数,而不是指向 exception_ptr
参数指向的内容。因为名称 copy_exception
在这种情况下是误导的,所以该函数被重命名为 std :: make_exception_ptr
+11标准。请参阅 C ++标准库缺陷报告1130 关于这个问题的细节和讨论。
When called with an exception_ptr
as argument, the function would return another exception_ptr
pointing to a copy of the exception_ptr
given as argument, instead of pointing to what the exception_ptr
argument points to. Because the name copy_exception
was misleading for this case, the function was renamed to std::make_exception_ptr
for the final C++11 standard. See the C++ Standard Library Defect Report 1130 for details and discussion on this issue.
std :: make_exception_ptr
函数在< exception>
。
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