Thread: type cast void* parameter to be a ProductType pointer

  1. #1
    Registered User
    Join Date
    Nov 2020

    type cast void* parameter to be a ProductType pointer

    typedef struct {
        EntityType ent;
        char name[MAX_STR];
        int  cost
    } ProductType;
    void moveProduct(void* product){
    I have a function moveProduct(void*) and I'm trying to figure out how to type cast the parameter to be a ProductType pointer, so that the product information is available. Does anyone know how to achieve this? I'm a little confused.

  2. #2
    Registered User
    Join Date
    Sep 2020
    You are playing with fire here... it will burn you!

    Here... have a match and some lighter fluid:

      ProductType *p;
      p = (ProductType *)product.

  3. #3
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Why don't you just change the parameter to be a ProductType pointer? If you cannot do this because say, this function is intended to be passed as some kind of generic callback, then yes, casting to ProductType* in the function body is the right approach.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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