Re: sizeof

From:
James Kanze <james.kanze@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Sat, 8 Mar 2008 01:42:02 -0800 (PST)
Message-ID:
<7abd8a90-04ba-424c-b8ab-6b1ddd72b925@34g2000hsz.googlegroups.com>
On 7 mar, 22:37, Slain <Slai...@gmail.com> wrote:

On Mar 7, 4:19 pm, Ian Collins <ian-n...@hotmail.com> wrote:

Slain wrote:

I am using sizeof to doa memcpy but run into probs because of the
following problem.

static char arr1[] = {0x01,0x00,0x03,0x04};
static char arr2[] = {0x00,0x03,0x04,0x06,0x07};

const char* string_CDR[8]= {arr1,arr2};

cout<<"The size of is " <<sizeof(arr1)<<" and "<<sizeof(arr2) <<endl;=

cout<<"The size of is " <<sizeof(string_CDR[0])<<" and
"<<sizeof(string_CDR[1]) <<endl;


This line outputs sizeof(char*) twice.

This is messing up my memcpy in the main function as the
sizeof is not what I am expecting. Can anyone point out
the problem.


There is no way to calculate the size of the arrays pointed to in
string_CDR.

Use std::vector.


DOn't have STL's.


Why not? The alternative is reimplementing all of the logic it
contains manually. You seem to want the behavoir of a
container. So you really only have two choices: use the
standard containers, or implement one yourself.

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