Phobos is the official runtime and standard library of the D programming language.
Questions tagged [phobos]
97 questions
3
votes
1 answer
Using std.algorithm.map with member functions in D2
I have:
Foo foo = new Foo();
foreach (i; 0..10)
{
Bar bar = foo.getBar(i);
...
}
I want to be able to instead say (equivalently):
foreach (bar; foo.getAllBars())
{
...
}
How do I go about implementing getAllBars()?
I figured something like…
Peter Alexander
- 53,344
- 14
- 119
- 168
3
votes
1 answer
Why does Nullable!(Nullable!int) refuse to compile?
The following code refuses to compile:
Nullable!(Nullable!int) nni = Nullable!(Nullable!int)(10);
With this error message:
Error: inout method nullable.Nullable!(Nullable!(immutable(int))).Nullable.this is not callable using a mutable object
Why?
Meta
- 1,091
- 6
- 14
3
votes
2 answers
Where is Date roll is useful?
I am reading Phobos docs. Sometimes I can't understand the logic of some methods.
Date roll
Adds the given number of years or months to this Date. A negative number will subtract. The difference between rolling and adding is that rolling does not…
Suliman
- 1,469
- 3
- 13
- 19
3
votes
1 answer
Reading a single character from stdin in D
The documentation for std.stdio does not list a read function which could be used to get a single character from standard input, only readln to get a line. std.file has read function, but it needs a file name, which is not available for the standard…
Chloride Cull
- 741
- 1
- 7
- 16
3
votes
1 answer
D: Cannot seem to create an std.container.Array of const struct pointers
Suppose I have a struct type Foo. I'm trying to create an std.container.Array of const pointers to Foo. I tried the obvious first:
import std.container;
alias FooArray = Array!(const(Foo*));
However, this causes a compiler error. Then I tried it…
Koz Ross
- 3,040
- 2
- 24
- 44
3
votes
1 answer
Return value of std.regex.regex?
I'm trying to write a function that takes an input string, a regex (made by std.regex.regex from a rawstring) and an error message string, and attempt to match something from the input string using the regex, displaying the error message if there…
Koz Ross
- 3,040
- 2
- 24
- 44
3
votes
1 answer
D parallel loop
First, how D create parallel foreach (underlying logic)?
int main(string[] args)
{
int[] arr;
arr.length = 100000000;
/* Why it is working?, it's simple foreach which working with
reference to int from arr, parallel function…
dev1223
- 1,148
- 13
- 28
3
votes
0 answers
Reflections on Serialization APIs in D
In the road to develop a new kind of search engine that caches types, statistics, etc about files and directories I'm currently trying to implement persistent caching of my internal directory tree using msgpack-d:
Why doesn't msgpack-d and, from…
Nordlöw
- 11,838
- 10
- 52
- 99
3
votes
2 answers
Check if string starts with a substring in D / phobos?
I haven't so far found how I can most easily check if a string starts with a certain character in D.
I want something like:
if (my_str.startswith("/")) {
// Do something
}
The closest I found was "chompPrefix" (here), but that is not really…
Samuel Lampa
- 4,336
- 5
- 42
- 63
3
votes
1 answer
Using std.range.Lockstep as an input range
Duplicating http://forum.dlang.org/thread/arlokcqodltcazdqqlby@forum.dlang.org to compare answer speed :)
I basically want to be able to do stuff like this:
auto result = map!( (a, b) => a+b )( lockstep(range1, range2) );
Are there any standard…
Mihails Strasuns
- 3,783
- 1
- 18
- 21
2
votes
1 answer
How to encapsulate an existing array using D2's phobos std.range
I would like to encapsulate an existing data array ( created by Python's Numpy Lib ) into an Array like object in the D2 Language... without having to copy the array data... I already use Python's cTypes Lib to make a DLL call, passing array lengths…
Peter Li
- 295
- 1
- 2
- 9
2
votes
1 answer
How do I create a 2D Array in D?
This should be simple enough, but it's not.
import std.container, std.stdio;
void main(){
alias Array!double _1D;
alias Array!_1D _2D;
_1D a = _1D();
_2D b = _2D();
a.insert(1.2);
a.insert(2.2);
a.insert(4.2);
b.insert(a);
…
Arlen
- 6,641
- 4
- 29
- 61
2
votes
1 answer
How convert a D array to C variadic?
I would like convert an array in D of the form:
string[] arrayStr = [ "hi, "is fun", "use D programming" ];
I have a C function which takes a C variadic:
void c_func( const char* format, ... );
I could do:
foreach(str; arrayStr)
func( str…
bioinfornatics
- 1,749
- 3
- 17
- 36
2
votes
1 answer
Where is D's `std.sumtype`?
I'm working on a project in the D language and I want to use a module from the standard library called std.sumtype. I'm on debian oldstable, and I've tried both GDC and LDC. DMD is unavailable, because I'm using a machine with an armhf architecture.…
VintiumDust
- 95
- 1
- 6
2
votes
2 answers
How to use tolower in D
I want to to put the first letter of a string into lowercase in D.
As a string is imutable in D, there doesn't seem to be a simple way.
I came up with this:
string mystr = "BookRef";
string outval = toLower( mystr[0..1] ) ~ mystr[1..$];
writeln(…
A.Franzen
- 725
- 4
- 10