Interesting non-trivial problem! MAJOR UPDATE With all that’s happened, I’ve rewrote the answer and removed some dead ends. I also timed the various solutions on different cases. Here’s the first, rather simple but slow, solution: flatten1 <- function(x) { y <- list() rapply(x, function(x) y <<- c(y,x)) y } rapply lets you traverse a list … Read more
There is no function that does this in the C standard. Unix systems that comply with POSIX are required to have strcasecmp in the header strings.h; Microsoft systems have stricmp. To be on the portable side, write your own: int strcicmp(char const *a, char const *b) { for (;; a++, b++) { int d = … Read more
I liked the http://ipify.org. They even provide Python code for using their API. # This example requires the requests library be installed. You can learn more # about the Requests library here: http://docs.python-requests.org/en/latest/ from requests import get ip = get(‘https://api.ipify.org’).content.decode(‘utf8’) print(‘My public IP address is: {}’.format(ip))
PyCharm is lying to you. The source code you’re looking at is a fake that PyCharm has created. PyCharm knows what functions should be there, and it can guess at their signatures using the function docstrings, but it has no idea what the function bodies should look like. If you want to see the real … Read more
There are a number of reasons why this a bad idea. First, this is a bad idea because the standard containers do not have virtual destructors. You should never use something polymorphically that does not have virtual destructors, because you cannot guarantee cleanup in your derived class. Basic rules for virtual dtors Second, it is … Read more
Deprecated Functions Insecure A perfect example of such a function is gets(), because there is no way to tell it how big the destination buffer is. Consequently, any program that reads input using gets() has a buffer overflow vulnerability. For similar reasons, one should use strncpy() in place of strcpy() and strncat() in place of … Read more
You can convert to a Set and back to an Array again quite easily: let unique = Array(Set(originals)) This is not guaranteed to maintain the original order of the array.
Short story: overload when you can, specialise when you need to. Long story: C++ treats specialisation and overloads very differently. This is best explained with an example. template <typename T> void foo(T); template <typename T> void foo(T*); // overload of foo(T) template <> void foo<int>(int*); // specialisation of foo(T*) foo(new int); // calls foo<int>(int*); Now … Read more
There are a couple of possibilities. One I like uses a stringstream as a go-between: std::ifstream t(“file.txt”); std::stringstream buffer; buffer << t.rdbuf(); Now the contents of “file.txt” are available in a string as buffer.str(). Another possibility (though I certainly don’t like it as well) is much more like your original: std::ifstream t(“file.txt”); t.seekg(0, std::ios::end); size_t … Read more
The sane way to approach it would be to develop a 3rd party library and make it available over the internet through open source, Github etc. The GNU C dialect is one such example, which is a collection of non-standard compiler extensions used by the GCC compiler. One could join the GCC open source group … Read more