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size of a buffer

mortex · 2002-06-27T20:24:16

Hey Is it possible to get the size of the memory allocated to a buffer? so that I can have, void foo(char*) instead of void foo(char*,size_t) I know that the buffer is always a char. Any ideas? Thanks! [edited by - mortex on June 26, 2002 3:24:12 AM]

General and Gameplay Programming Programming

Started by mortex June 26, 2002 02:23 AM

23 comments, last by mortex 21 years, 10 months ago

SabreMan

504

June 27, 2002 08:46 AM

quote:Original post by gilady
Well of course the command is _msize and not sizeof.

There is no such function in Standard C or C++.

quote:
And yes c++ compiler usually (the ones I know of) write the size of the buffer they allocated in the 4 bytes before the buffer.

The Standard does not mandate that, so it is unwise to rely on it when there is a satisfactory alternative. And there is a satisfactory alternative.

daerid

354

June 27, 2002 01:19 PM

just use a friggin std::vector

cripes

daerid@gmail.com

Vorlath

122

June 27, 2002 07:26 PM

Just a suggestion... maybe BSTR would help you out. Bstrings have 2 (or is 4???) bytes before your pointer that tells how long the buffer is. There are functions for allocation, deletion, setting the buffer size, etc... Might be worth a look.

Dobbs

164

June 27, 2002 07:47 PM

Vorlath you''ve got to be kidding.

Option 1: Use a well documented, standard data structure (std::vector)

Option 2: Use some obscure Win32 datatype (BSTR which is actually an OLECHAR FAR* which is god knows what, I couldn''t find any typedefs for those)

This is a tough one...

SabreMan your sig should be "SabreMan... fighting C/C++ one line of code at a time," or maybe "SabreMan... USE THE GODDAMN STL"