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std::current_exception

科技促进发展：当前[医]例外

Defined in header ​​
std::exception_ptr current_exception(​(since C++11)

如果在异常处理%28期间调用，则在catch子句%29捕获当前异常对象并创建std::exception_ptr它根据实现%29保存对异常对象%28的副本或引用。引用的对象至少在exception_ptr对象引用它。

如果此函数的实现需要调用new调用失败时，返回的指针将保存对std::bad_alloc...

如果此函数的实现需要复制捕获的异常对象，并且其复制构造函数抛出异常，则返回的指针将保存对抛出的异常的引用。如果抛出的异常对象的复制构造函数也抛出，则返回的指针可能包含对std::bad_exception打破无尽的循环。

如果在不处理异常时调用该函数，则为空std::exception_ptr会被归还。

参数

%280%29

返回值

的实例std::exception_ptr保存对异常对象或异常对象的副本的引用，或保存对std::bad_alloc的实例std::bad_exception...

例外

noexcept规格：

noexcept

例

二次

#include <iostream>
#include <string>
#include <exception>
#include <stdexcept>
 
void handle_eptr(std::exception_ptr eptr) // passing by value is ok
{
    try {
        if (eptr) {
            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

二次

产出：

二次

Caught exception "basic_string::at"

二次

另见

exception_ptr (C++11)shared pointer type for handling exception objects (typedef)
rethrow_exception (C++11)throws the exception from an std::exception_ptr (function)
make_exception_ptr (C++11)creates an std::exception_ptr from an exception object (function template)

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