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std::set_new_handler

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< cpp‎ | memory‎ | new

 
 
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initializer_list(C++11)
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動的なメモリ管理
低レベルのメモリ管理
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nothrow
 
Defined in header <new>
std::new_handler set_new_handler(std::new_handler new_p)
new_p新しいグローバル新ハンドラ関数になり、以前にインストールされた新しいハンドラを返します。.
Original:
Makes new_p the new global new-handler function and returns the previously installed new-handler.
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目次

[編集] ノート

で呼び出される関数です。本来の目的は次の3つのいずれかになります
Original:
The new-handler function is the function called by
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1)
より多くのメモリを利用できるようにします
Original:
make more memory available
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2)
プログラムを終了する(例えば呼び出しstd::terminateによる)
Original:
terminate the program (e.g. by calling std::terminate)
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3)
タイプstd::bad_allocの例外をスローしたりstd::bad_alloc由来
Original:
throw exception of type std::bad_alloc or derived from std::bad_alloc
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ハンドラがリターンした場合、割り当て関数は、以前に割り当てに失敗した試行を繰り返し、割り当てが再び失敗した場合は新しいハンドラ再び呼び出します。ループを終了するには、新しいハンドラーとはstd::set_new_handler(nullptr)を呼び出すことができます:割り当てに失敗した試行後、割り当て関数はstd::get_new_handlerがnullポインタ値を返すことを見つけ、もし、それがstd::bad_allocがスローされます.
Original:
If new-handler returns, the allocation function repeats the previously-failed allocation attempt and calls the new-handler again if the allocation fails again. To end the loop, new-handler may call std::set_new_handler(nullptr): if, after a failed allocation attempt, allocation function finds that std::get_new_handler returns a null pointer value, it will throw std::bad_alloc.
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プログラムの起動時に、ハンドラがnullポインタです.
Original:
At program startup, new-handler is a null pointer.
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[編集] パラメータ

new_p -
タイプstd::new_handler、またはNULLポインタの関数へのポインタ
Original:
pointer to function of type std::new_handler, or null pointer
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[編集] 値を返します

以前にインストールされた新しいハンドラ、またはどれもインストールされていない場合は、nullポインタ値.
Original:
The previously-installed new handler, or a null pointer value if none was installed.
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[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集]

#include <iostream>
#include <new>
void handler()
{
    std::cout << "Memory allocation failed, terminating\n";
    std::set_new_handler(nullptr);
}
int main()
{
    std::set_new_handler(handler);
    try {
        while(true)
            new int[100000000ul];
    }catch(const std::bad_alloc& e) {
        std::cout << e.what() << '\n';
    }
}

Output:

Memory allocation failed, terminating
std::bad_alloc

[編集] も参照してください

割り当て関数
Original:
allocation functions
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(機能) [edit]
set_new_handler
新しいハンドラを登録します
Original:
registers a new handler
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(機能) [edit]
新しいハンドラの関数ポインタ型
Original:
function pointer type of the new handler
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(typedefです) [edit]
メモリ割り当てが失敗したときに例外がスローされます
Original:
exception thrown when memory allocation fails
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(クラス) [edit]