I am trying to acquaint myself with the use/abuse of classes and have hit a snag Here is my test sketch class train { private: char *_name; public: train() //constructor - no return type { } void setName(char *name) { strcpy(_name, name); //save the name …

All above does not answer your question. So now I get to the more desperate options... Is train() a reserved function??? It appears in greenish color on my phone... Did you try to rename your class?

Got it working. The error message was misleading because the cause of the problem was the misuse of the char * class train { private: char _name[20]; public: train() //constructor - no return type { } void setName(char name[20]) { strcpy(_name, name); //save…

[image] UKHeliBob: Got it working. The error message was misleading because the cause of the problem was the misuse of the char * Your setName() function doesn't need to modify the source string. So, promise the compiler that you won't try to. Then get rid of the casts when you call it: clas…

[image] gfvalvo: char *getName(){ return _name; This allows change of the private variable from outside... (violates the private label). Should be: char const * const

if you decide tou want to keep a local copy instead than a pointer to the original cString , I would recommend to use strncpy() or strlcpy() to not overflow your buffer size. change [image] UKHeliBob: strcpy(_name, name); //save the name into strlcpy(_name, name, sizeof _…

[image] UKHeliBob: Got it working. The error message was misleading because the cause of the problem was the misuse of the char * char _name[20]; obviously you can't copy a string to a point. perhaps a better alternative is to define a ptr, but malloc space once you know the size of th…

Thanks for all the tips I have moved the sketch on quite a bit since getting past the original error, to the extent that I now have an array of Train (uppercase T @J-M-L ) objects each with several more member variables [image] J-M-L: I would advise against using _name for members Is there …

[image] UKHeliBob: [image] build_1971: This allows change of the private variable from outside... How so ? Because your original getName() returned a pointer to name. That returned pointer could be used to modify name without the class's knowledge. Per Post #9 , return a const char *,

[image] gcjr: perhaps a better alternative is to define a ptr, but malloc space once you know the size of the string Then you might as well use a String class object rather than allocating the storage yourself. That guarantees that the storage will be freed when the containing object is destr…

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gfvalvo October 21, 2024, 11:53am 9

I wasn't yet addressing that part of the code, just the cause of the error message. But yea, it should be const char *getName() {. The other const is not needed as the pointer itself is passed by value.

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Member functions of a class

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