pointer type casting

This is a discussion on pointer type casting within the C++ Programming forums, part of the General Programming Boards category; hi all, Code: typedef unsigned int uint32 typedef unsinged short uint16 typedef unsinged char uint8 ... ... uint8* data; uint32 ...

  1. #1
    char main() RoshanX's Avatar
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    pointer type casting

    hi all,

    Code:
    typedef unsigned int uint32
    typedef unsinged short uint16
    typedef unsinged char uint8
    
    ...
    ...
      uint8* data;
      uint32 source;
      *(uint32*)data=(uint32)source;
    why would this code give the following error
    "invalide operands of type "int" and "uint32*" to binary 'operator*' " ?

    thank you in advance
    First there was God. He was quite lonely, so he created Dennis.
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  2. #2
    Confused Magos's Avatar
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    1) casting source to uint32 is useless since it's an uint32 already
    2) casting data (uint8*) to uint32* then trying to assign a value will write 3 bytes outside the valid range (DANGER!)
    3) data isn't pointing at anything valid (DANGERx2!)
    4) You should use static_cast and reinterpret_cast instead of the old C-style casts

    What exactly are you trying to do?
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