A string literal refers to an array that lives in static memory. A char array is not the same as a char pointer. What will result in undefined behavior is following: This will create array on stack with bytes "Hello Heap\0", and then tries to return pointer to first byte of that array (which can, in calling function, point to anything). It doesn't affect the space that you just allocated by malloc; furthermore, since this space isn't referenced any more, it will remain allocated but unused until your program exits. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Wow. Sorry Felice, but you haven't understood my point; the memory leak is not in the assignment (and strcpy does not help at all, either). Why is the first paragraph half about array decay and array pointers when there's none here, and half about saying that pointer+size array passing is somehow related to dynamic allocation, when it's not? Be careful, though, to either agree on a fixed size for such calls (through a global constant), or to pass the maximum size as additional parameter, lest you end up overwriting buffer limits. Extracting arguments from a list of function calls, Adding EV Charger (100A) in secondary panel (100A) fed off main (200A), Canadian of Polish descent travel to Poland with Canadian passport, Passing negative parameters to a wolframscript. @iksemyonov True, but I'll leave that for another question :), First things first: how would you return an. is there such a thing as "right to be heard"? If you are not going to change the chars pointed by the returnValue pointer ever in your programme, you can make it as simple as: This function creates allocates a memory block, fills it with the following: And then returns the address off the first element 't'. Loop (for each) over an array in JavaScript. SET_ERROR_MESSAGE is defined by a 3rd party library. If you absolutely need to return an array of strings using raw pointers (which you don't in C++! 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Function mycharheap() is leaking: you make your pointer point to a memory region of the length of one char allocated on the heap, and then you modify that pointer to point to a string literal which is stored in read-only memory. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. A basic example would look like this: and when should I call delete[] on it. I do agree with the change, but as an advice, never assume the op will know the same things than you. Not the answer you're looking for? It's safe to say the OP's code is more complicated than returning some fixed values (there would be no point). It's that you are reserving memory via malloc, but. A char array is returned by char*, but the function you wrote does not work because you are returning an automatic variable that disappears when the function exits. Is it safe to publish research papers in cooperation with Russian academics? I have previously created many functions that return character strings as char arrays (or at least pointers to them). What you probably should be using here is std::string instead. I guess the string stored in mychar() is also on stack. What are the advantages of running a power tool on 240 V vs 120 V? String literals (stuff in quotes) are read-only objects of type array of char, stored in some sort of read-only memory (neither on stack or heap). Feel free to ask more questions. Why are players required to record the moves in World Championship Classical games? You seem to be thinking of char* as type for string variables. Now to your question. Well, SET_ERROR_MESSAGE accepts const char*'s but as per your advice I would use a function that returns a std::string, then I need to convert it to const char* to be able to use it.
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