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C++ って、new と malloc を共存させていいの？

malloc の対象は char なのですが。

何かで「new と malloc は、同じ領域を、別々の方法で管理するので一緒に使ってはいけない」と、読んだ記憶が．．．あれれ？？？PlatformSDK の、HeapAlloc はどうなんだろう？

で、google で「"C++" new malloc」を検索してみたのですが、「malloc を使う必要はない」とか、「new と malloc を同一視してはいけない」というページは多々あるものの、「一緒に使ってはいけない」という記事はない。

malloc だとコンストラクタが走らないとか、そういうことを記憶違いしていたのかなぁ？？？

投稿日時 : 2007年1月9日 21:56

# re: C++ って、new と malloc を共存させていいの？
επιστημη
Posted @ 2007/01/09 22:52
mallocしたのをdeleteするな
newしたのをfreeするな
って意味で「一緒に使うな」だったらわかるんすけどね。
# re: C++ って、new と malloc を共存させていいの？
Blue
Posted @ 2007/01/10 1:00
MFCは、mallocとnewが普通に混在しているようなんだけど。
# re: C++ って、new と malloc を共存させていいの？
恣意の
Posted @ 2007/01/10 1:36
というか、"一緒に使ってはいけない"だと、
CとC++が混在するソースを扱ってる奴は死んじゃうような

>mallocしたのをdeleteするな
>newしたのをfreeするな
やっぱりこれを思い違いしたんだと思います
# re: C++ って、new と malloc を共存させていいの？
bear.mini
Posted @ 2007/01/10 12:42
私も同じプログラムの中で new と malloc() を併用してはいけないという経験則を持っていた時期がありました。
# 同様の経験則として「std::cout と printf() を
# 併用するとコンソール出力がうまくいかない」という
# のもありました。
# Borland の C++ コンパイラの結構古いバージョンを
# 使っていたころだったかなぁ。

その後、VC++ 7 とか 7.1 のランタイムのソースを見たとき、グローバルな operator new() を実装するために内部で malloc() を使っていたのを目にして「一緒に使っても大丈夫そうだな」と思ったような記憶があります。
# re: C++ って、new と malloc を共存させていいの？
Jitta
Posted @ 2007/01/10 19:43
επιστημηさん、Blueさん、恣意のさん、コメントありがとうございます。

　むぅ。。。やはり思い違いの線が濃厚ですね。いや、安心しました。ありがとうございます。

bear.miniさん、コメントありがとうございます。

> # Borland の C++ コンパイラの結構古いバージョンを
…あはは。私も、Borland C++ ユーザです。BC++ が、特殊だったのだろうか？
# re: C++ って、new と malloc を共存させていいの？
とっちゃん
Posted @ 2007/01/11 11:54
new/delete malloc/free で使ってる分には、同居可能ですね。
ヒープメモリーの扱いは、常に対になるアロケータセットを利用している限り問題になることはありません。
実装に依存とかもないはずですが、混同はだめです。
たとえ、実装上問題がないとしても...です。
＃new や delete は malloc/free に言語レベルで呼び出しコードを追加するため

HeapAlloc などのAPIについても、対になるAPI(HeapAllocならHeapFreeなど)を使っていれば同居可能です。

コンソール関係では、stdio 系(coutはこれと同じ)と、conio 系を一緒に使ってはダメというのはありますね。

stdio 系は、CRT側のストリームキャッシュがいるので、大変な事態になります。
ま、せいぜいでも取りこぼし程度というのはありますがｗ
特にインプット系(getchar() と _getch()を同時利用とか)では注意が必要です。
＃9x系とNT系で動作が違うというのもあるんですがねｗ

GUI/CUIに限らず入出力系統は同一にするというのはありますけどねｗ
# re: C++ って、new と malloc を共存させていいの？
new
Posted @ 2007/11/25 8:06
動作はするかもしれないけど、あまり薦められません。
Cの関数と連帯する場合以外は基本的にnew演算子を使うほうがいいと思います。
_getch()とgetchar()を混同して大変な動作をしたことがあるのでわかるのですが、共存させる場合は特に注意が必要です。
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