std::exception_ptr
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| Defined in header <exception>
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| typedef /*unspecified*/ exception_ptr; |
（C++11 起） | |
std::exception_ptr是一个可为空指针类型，管理一个被抛出的异常对象和拍摄的std::current_exception。 std::exception_ptr的一个实例传递给另一个函数，可能在另一个线程，可能会被重新抛出异常和处理的catch子句.Original:
std::exception_ptr is a nullable pointer-like type that manages an exception object which has been thrown and captured with std::current_exception. An instance of std::exception_ptr may be passed to another function, possibly on another thread, where the exception may be rethrown and handled with a catch clause.The text has been machine-translated via Google Translate.
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默认构造
std::exception_ptr是一个空指针，它不指向一个异常对象，.Original:
Default-constructed
std::exception_ptr is a null pointer, it does not point to an exception object.The text has been machine-translated via Google Translate.
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比较平等的，只有当他们都是null，或都指向相同的异常对象的两个实例
std::exception_ptr.Original:
Two instances of
std::exception_ptr compare equal only if they are both null or both point at the same exception object.The text has been machine-translated via Google Translate.
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std::exception_ptr是任何算术，枚举，或指针类型不能隐式转换。它转换为boolOriginal:
std::exception_ptr is not implicitly convertible to any arithmetic, enumeration, or pointer type. It is convertible to bool.The text has been machine-translated via Google Translate.
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异常对象所引用的
std::exception_ptr仍然有效，只要仍然有至少一个std::exception_ptr引用它：std::exception_ptr是一个共享所有权的智能指针.Original:
The exception object referenced by an
std::exception_ptr remains valid as long as there remains at least one std::exception_ptr that is referencing it: std::exception_ptr is a shared-ownership smart pointer.The text has been machine-translated via Google Translate.
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[编辑] 为例
#include <iostream> #include <string> #include <exception> #include <stdexcept> void handle_eptr(std::exception_ptr eptr) // passing by value is ok { try { if (eptr != std::exception_ptr()) { std::rethrow_exception(eptr); } } catch(const std::exception& e) { std::cout << "Caught exception \"" << e.what() << "\"\n"; } } int main() { std::exception_ptr eptr; try { std::string().at(1); // this generates an std::out_of_range } catch(...) { eptr = std::current_exception(); // capture } handle_eptr(eptr); } // destructor for std::out_of_range called here, when the eptr is destructed
Output:
Caught exception "basic_string::at"
[编辑] 另请参阅
| （C++11） |
创建一个异常对象的std::exception_ptr Original: creates an std::exception_ptr from an exception object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板） |
| （C++11） |
captures the current exception in a std::exception_ptr （函数） |
| （C++11） |
从std::exception_ptr抛出的异常 Original: throws the exception from an std::exception_ptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数） |
