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Tip of the Day
Language: C++
Expertise: Beginner
Aug 8, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Indirection Operator

Question:
Can you use the indirection operator like a memcpy to copy the contents of a structure like this?

*m_pMyInfo = stMyInfo;
Or should you use the memcpy function?

memcpy(m_pMyInfo, &stMyInfo, sizeof(MY_INFO));

Answer:
The best way to copy structs is by using the operator =. C and C++ automatically define this operator for every struct, so there's no need to resort to low-level and unsafe functions such as memcpy():

struct A
{
int n;
float f;
};

A * pa;
A b, c;
// fill b and c
pa = & b;
*pa=c; // works in C and C++
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