c++17

问题 Transforming a sprite in SFML, does not regard it's new origin. In my case sf::Sprite is rotating around the axis that is in the left top corner ({0,0}) regardless its origin. Setting new origin with .setOrigin() earlier takes no effect. I am sure that sprite is getting the right origin position earlier which is center of rectangle. My code: In each of my Card class constructors I set the origin of my sprite. card_sprite.setOrigin(Card::get_default_single_card_size().x*Game::get_scale()/2

问题 I need to update a 100M-element array and would like to do it in parallel. std::for_each(std::execution::par, ...) seems great for this, except that the update needs to access elements of other arrays depending on the index that I am updating. A minimal serial working example of the kind of thing I'm trying to parallelize might look like this: for (size_t i = 0; i < 100'000'000; i++) d[i] = combine(d[i], s[2*i], s[2*i+1]); I could of course manually spawn threads, but that is a lot more code

问题 I need to update a 100M-element array and would like to do it in parallel. std::for_each(std::execution::par, ...) seems great for this, except that the update needs to access elements of other arrays depending on the index that I am updating. A minimal serial working example of the kind of thing I'm trying to parallelize might look like this: for (size_t i = 0; i < 100'000'000; i++) d[i] = combine(d[i], s[2*i], s[2*i+1]); I could of course manually spawn threads, but that is a lot more code

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)

问题 Following the code in this question, I have a std::bind with a variadic template function. If I try to provide a function template with auto return, gcc rejects the program: #include <functional> template <typename... Args auto inv_impl(Args... a) { return (a + ...); } template <typename... Args> auto inv(Args... args) { auto bound = std::bind(&inv_impl<Args...>, args...); return bound; } int main() { auto b = inv(1, 2); } The compile error is: foo.cc: In instantiation of ‘auto inv(Args ...)