standard-library

Can someone tell me why I am getting different results when using Tuple2[List,List] and List[List] as my Product in the code below? Specifically I would like to know why the second value of the list of lists gets wrapped in another list? scala> val a = List(1,2,3) a: List[Int] = List(1, 2, 3) scala> val b = List(4,5,6) b: List[Int] = List(4, 5, 6) scala> val c = List(a,b) c: List[List[Int]] = List(List(1, 2, 3), List(4, 5, 6)) scala> c.productIterator.foreach( println(_) ) List(1, 2, 3) List(List(4, 5, 6)) // <-- Note this scala> val d = (a,b) d: (List[Int], List[Int]) = (List(1, 2, 3),List(4,

I'd like to write a library that's a thin wrapper around some of the functionality in BTreeMap . I'd prefer not to tightly couple it to that particular data structure though. Strictly speaking, I only need a subset of its functionality, something along the lines of the NavigableMap interface in Java. I was hoping to find an analogous trait I could use. I seem to recall that at some point there were traits like Map and MutableMap in the standard library, but they seem to be absent now. Is there a crate that defines these? Or will they eventually be re-added to std? No, right now there's only

I wrote a program that uses the console. Most of the time, the user must see the console informations. For a specific function from command line, I would like to run the script without the console rises. I just don't want see the window but it can be in the task bar. I know I can use extra modules (gui, win32,..) to do that but I would like to use the standard python librairy. Is it possible to do that? The program should run on Windows. (python 2.7) I specify... I know I can use pythonw.exe too. The question then is how to launch the same script with python.exe sometimes and with pythonw.exe

The C standard (ISO/IEC 9899) states: 7.2x.2.2 The difftime function Synopsis #include <time.h> double difftime(time_t time1, time_t time0); Description The difftime function computes the difference between two calendar times: time1 - time0 . Returns The difftime function returns the difference expressed in seconds as a double . This leaves it ambiguous (I guess, intentionally) if the result accounts for leap seconds or not. The difference (26 seconds when comparing from 1970 to July 2015) matters in some applications. Most implementations of the C standard library do not account for leap

Many Python builtin "functions" are actually classes, although they also have a straightforward function implementation. Even very simple ones, such as itertools.repeat . What is the motivation for this? It seems like over-engineering to me. Edit: I am not asking about the purpose of itertools.repeat or any other particular function. It was just an example of a very simple function with a very simple possible impementation: def repeat(x): while True: yield x But itertools.repeat is not actually a function, it's implemented as a class. My question is: Why? It seems like unnecessary overhead.

I am trying to write a quadtree sparse matrix class. In short, a quadtree_matrix<T> is either the zero matrix or a quadruple (ne, nw, se, sw) of quadtree_matrix<T> . I'd like eventually to test different allocation schemes since this will probably impact the performance of linear algebra operations. So I will also template quadtree_matrix on a standard allocator type, so that I can reuse existing allocators. I will have to allocate two different kind of data: either a T , or a node , which contains four pointers (to either T or node). For all the algorithms I will consider, I know for sure

I'm trying to compile a static library (let's call it library.a). This library consumes resources of standard libraries. There is some way that the library can statically link a standard library. I have proven something like: g++ -c library -static-libstdc++ -o library.o ar rcs library.o library.a But if I do so there is no link to the standard libraries. Then I have proved this way: g++ library -static-stdlib -o library.o ar rcs library.o library.a But ask me to add a main function. Is there any possibility of creating a static library by statically linking also standard libraries (std ::