unique_ptr - invalid pointer and segfault
c++, c++11, pointers, sfml, unique-ptr
Solution
`std::unique_ptr` assumes sole ownership of the pointed-to object, and deletes the object when the `unique_ptr` goes out of scope. So after `detectCollision` returns, `charSprite` is deleted. Since you never actually allocated `charSprite` (but rather allocated `iPlayer`, with `charSprite` in it), that's not kosher.
It sounds like you don't actually want `unique_ptr` here. You don't intend to transfer ownership.
Problem
I am learning a new C++11 standard and writing small game in SFML. I have followed code where I am trying to pass a pointer of a sprite to another object. ``` bool Game::detectCollision() { std::unique_ptr<sf::Sprite> sprPtr1(&iPlayer.charSprite); return field.detectCollision(sprPtr1); } bool FieldElem::detectCollision(std::unique_ptr<sf::Sprite> charSprite) { std::cout << "X: " << charSprite->getPosition().x << std::endl; return true; } ``` This code compiles without warning and gives me following segfault during a runtime: ``` *** glibc detected *** ./game: munmap_chunk(): invalid pointer: 0x00007fffb8617d90 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7f8694b37b96] ./game(_ZN2sf6SpriteD0Ev+0x24)[0x405772] ``` Why my pointer is invalid? I think I am missing some important detail regarding unique_ptr...