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std::current_exception

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< cpp‎ | error

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
エラー処理
例外処理
Original:
Exception handling
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exception
uncaught_exception
exception_ptr(C++11)
make_exception_ptr(C++11)
current_exception(C++11)
rethrow_exception(C++11)
nested_exception(C++11)
throw_with_nested(C++11)
rethrow_if_nested(C++11)
例外処理の失敗
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate(C++11)
set_terminate
unexpected(廃止予定)
bad_exception
unexpected_handler(廃止予定)
get_unexpected(C++11)(廃止予定)
set_unexpected(廃止予定)
例外カテゴリ
Original:
Exception categories
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logic_error
invalid_argument
domain_error
length_error
out_of_range
runtime_error
range_error
overflow_error
underflow_error
エラーコード
Original:
Error codes
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エラーコード
errno
アサーション
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Assertions
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assert
SYSTEM_ERROR施設
Original:
system_error facility
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error_category(C++11)
generic_category(C++11)
system_category(C++11)
error_condition(C++11)
errc(C++11)
error_code(C++11)
system_error(C++11)
 
Defined in header <exception>
std::exception_ptr current_exception()
(C++11およびそれ以降)
(通常、catch句の中で)例外処理時に呼び出された場合、現在の例外オブジェクトを捕捉し、その例外オブジェクトへの参照を保持std::exception_ptrを作成するか、またはコピーがある場合は、その例外オブジェクトのコピーに(それは実装で定義されてい製)
Original:
If called during exception handling (typically, in a catch clause), captures the current exception object and creates an std::exception_ptr that holds a reference to that exception object, or to a copy of that exception object (it is implementation-defined if a copy is made)
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この関数の実装はnewへの呼び出しを必要とし、呼び出しが失敗した場合は、返されたポインタはstd::bad_allocのインスタンスへの参照を保持します
Original:
If the implementation of this function requires a call to new and the call fails, the returned pointer will hold a reference to an instance of std::bad_alloc
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この関数の実装は、キャプチャされた例外オブジェクトをコピーする必要があり、そのコピーコンストラクタが例外をスローした場合、返されるポインタは、スローされた例外への参照を保持します。スローされた例外オブジェクトのコピーコンストラクタはまた、スローされた場合、返されるポインタは、無限ループを断ち切るためにstd::bad_exceptionのインスタンスへの参照を保持するかもしれない.
Original:
If the implementation of this function requires to copy the captured exception object and its copy constructor throws an exception, the returned pointer will hold a reference to the exception thrown. If the copy constructor of the thrown exception object also throws, the returned pointer may hold a reference to an instance of std::bad_exception to break the endless loop.
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例外が処理されているときに関数が呼び出された場合は、空のstd::exception_ptrが返されます。.
Original:
If the function is called when no exception is being handled, an empty std::exception_ptr is returned.
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目次

[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

std::exception_ptrのインスタンスは例外オブジェクトへの参照を保持しているか、または例外オブジェクトのコピー、またはstd::bad_allocのインスタンスまたはstd::bad_exceptionのインスタンスへの.
Original:
An instance of std::exception_ptr holding a reference to the exception object, or a copy of the exception object, or to an instance of std::bad_alloc or to an instance of std::bad_exception.
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集]

[edit]
#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"

[編集] も参照してください

例外オブジェクトを処理するための共有ポインタ型
Original:
shared pointer type for handling exception objects
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(typedef) [edit]
std::exception_ptrから例外がスローされます
Original:
throws the exception from an std::exception_ptr
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(関数) [edit]
例外オブジェクトからstd::exception_ptrを作成します
Original:
creates an std::exception_ptr from an exception object
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(関数テンプレート) [edit]