I am new to C++ style casts and I am worried that using C++ style casts will ruin the performance of my application because I have a real-time-critical dead
If the C++ style cast can be conceptualy replaced by a C-style cast there will be no overhead. If it can't, as in the case of dynamic_cast
, for which there is no C equivalent, you have to pay the cost one way or another.
As an example, the following code:
int x;
float f = 123.456;
x = (int) f;
x = static_cast(f);
generates identical code for both casts with VC++ - code is:
00401041 fld dword ptr [ebp-8]
00401044 call __ftol (0040110c)
00401049 mov dword ptr [ebp-4],eax
The only C++ cast that can throw is dynamic_cast
when casting to a reference. To avoid this, cast to a pointer, which will return 0 if the cast fails.