Tidbits and Tricks for programming

[Dan]

U should only uses proces when they are needed, it dose not make scen to uses them rather then a procedure. And the avg new user dose not use them right b/c they do not understand the conspects of multy treading.

[Cervantes]

when you're typing out your code:
if you've typed this:

code:

for n : 1 .. 100

hit ctrl + enter, it will skip a line and type end for.
it even works if you've just typed

code:

for

it also works for ifs and loops and functions and whatnot.

EDIT: only works with Turing 4.0.5

[Andy]

wow.. thats cool... very useful for me cuz when i program in turing, i like to finish my loops/if statements/procs just so the indent will look prettier.. thx

[wtd]

dodge_tomahawk wrote:

in turing, you can just pass an array through a function and use upper to how big it is, in c, you have to shove the size in as well, kinda annoying

C++ templates and runtime type inferencing make this much easier.

code:

#include <iostream> template <typename T, size_t N> void println_all(T (&arr)[N]) {         for (int i = 0; i < N; i++)         {                 std::cout << arr[i] << std::endl;         } } int main() {         int a[] = {3,4,5};         println_all(a); }

[rizzix]

correct me if i'm wrong but i'm not sure that code would work for something like this:

code:

int a[] = new int[3]; a[0] = 1; a[1] = 2; a[2] = 3; println_all(a);

basically a dynamically allocted array?

[wtd]

rizzix wrote:

correct me if i'm wrong but i'm not sure that code would work for something like this:

code:

int a[] = new int[3]; a[0] = 1; a[1] = 2; a[2] = 3; println_all(a);

basically a dynamically allocted array?

Apparently not, according to my quick check.

[rizzix]

ic intersting.. i got to check this out myself.. nice tip btw!! 8)

[wtd]

I think what you're looking for is:

code:

int * a = new int[3];

[rizzix]

hmm then i get:

code:

test.cpp: In function `int main()': test.cpp:20: error: no matching function for call to `println_all(int*&)'

[wtd]

rizzix wrote:

hmm then i get:

code:

test.cpp: In function `int main()': test.cpp:20: error: no matching function for call to `println_all(int*&)'

Yes, because as far as the compiler is concered, a is just a pointer, and what's getting passed in is a reference to a pointer, not an array.

I believe it's a case of the compiler just not holding onto enough information to make this work. A and C++ compilers are notoriously lacking in their storage of information. The fact that many other languages do preserve this information is what opens up a lot of opportunities for optimization.

[rizzix]

yep thats true.. so i guess it only works for staticly allocated arrays.

EDIT: i'm not sure if this is the expected behaviour of ANSI C++ nywyz.. i had a feeling it would not work for dynamically allocated arrays.. but i dont see why not.. but then again.. instead of a literal (in our case 3) it could have been a variable.. then it appears to make more sense to why not.. of course i'm talking about dynamic'ly allocated arrays only.

[wtd]

rizzix wrote:

yep thats true.. so i guess it only works for staticly allocated arrays.

There might be a way to make it work. I just haven't found it yet.

[rizzix]

now i have second thoughts, i mean.. ok i need something clarified: does RTTI check allocated sizes etc.. or just Types only.

[wtd]

rizzix wrote:

now i have second thoughts, i mean.. ok i need something clarified: does RTTI check allocated sizes etc.. or just Types only.

I'm thinking it just checks types.