Questions tagged [static-array]
56 questions
75
votes
14 answers
Programmatically create static arrays at compile time in C++
One can define a static array at compile time as follows:
const std::size_t size = 5;
unsigned int list[size] = { 1, 2, 3, 4, 5 };
Question 1 - Is it possible by using various kinds of metaprogramming techniques to assign these values…
Hippicoder
- 1,565
- 3
- 17
- 21
58
votes
3 answers
Difference between char and char[1]
In C++ what is the difference (if any) between using char and char[1].
examples:
struct SomeStruct
{
char x;
char y[1];
};
Do the same reasons follow for unsigned char?
Matthieu N.
10
votes
3 answers
how to extract the name attribute from string array?
Hi I build a quiz application.
I have the following (values/)question.xml
- A
- B
- C
flangofas
- 332
- 1
- 5
- 15
10
votes
5 answers
How to initialise static arrays in D without a GC allocation?
In D, all array literals are dynamic arrays, and are therefore allocated by the GC.
Even in this simple example:
int[3] a = [10, 20, 30];
The array is heap-allocated and then copied into a.
How are you supposed to initialise a static array without…
Peter Alexander
- 53,344
- 14
- 119
- 168
10
votes
4 answers
static arrays defined with unspecified size, empty brackets?
For the C++ code fragment below:
class Foo {
int a[]; // no error
};
int a[]; // error: storage size of 'a' isn't known
void bar() {
int a[]; // error: storage size of 'a' isn't known
}
why isn't the member variable causing an error…
Ahmed Abdelkader
- 1,695
- 1
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- 12
9
votes
1 answer
Objective-C static inline NSString array
Hi :) I am trying to create a static C-Array of NSStrings.
This is what I tried:
static NSString** polygonNames = {@"Radical Isotope", @"Point", @"Line", @"Triangle", @"Square", @"Pentagon", @"Hextagon", @"Heptagon", @"Octagon", @"Nonagon",…
Georges Oates Larsen
- 6,812
- 12
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6
votes
5 answers
Can we create static array with a size that is an execute-time constant?
We all know the basic rules for static array:
int size = 20;
char myArray[size];
is not legal.
And.
const int size = 20;
char myArray[size];
is OK.
But, what about this.
int f(const int size)
{
char myArr[size];
}
void main()
{
f(2);
…
jslap
- 711
- 1
- 6
- 21
6
votes
3 answers
Count the number of elements in an array in C
How can I obtain the number of elements present in an integer array in C after the array is passed to a function? The following code doesn't work.
size=sizeof(array)/sizeof(array[0]);
user2266758
6
votes
2 answers
static array class variable "multiple definition" C++
I'm writing some code where I need to have a class variable that's a static int array. I understand that I can do this with something like this in the header file, A.h:
#ifndef A_H_
#define A_H_
class A
{
public:
static const int a[];
};
const…
rainbowgoblin
- 1,221
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5
votes
2 answers
"dynamic array of static arrays"
How do you specify a dynamic array of static arrays in C?
I want to make a struct holding two dynamic arrays of static arrays.
struct indexed_face_set {
double * [3] vertices;
int * [3] faces;
};
This should hold a dynamic list of vertices,…
user1858467
- 71
- 1
- 5
4
votes
2 answers
what is the point of having static arrays
I don't have a background in C or C++, so static arrays puzzle me a little. What are they for? Why are they allocated on the stack?
I imagine there's a performance benefit. Stack allocation is faster and there's no need for garbage collection. But…
fwend
- 1,813
- 2
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4
votes
5 answers
How does one declare a static array of custom data type with hard-coded values?
Goal:
I want to implement a hard-coded lookup table for data that doesn't change often, but when it does change I want to be able to quickly update the program and rebuild.
Plan:
My plan was to define a custom data type like so...
private class…
Someone Somewhere
- 23,475
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3
votes
2 answers
how to initialize static array within struct
I have this struct:
typedef struct {
int start;
int end;
char board[10][10];
} move;
when I try initializing it this way:
char new_board[10][10]
move struct new_move = {0, 0, new_board}
I get this error:
warning C4047: 'initializing'…
ishefi
- 480
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- 12
3
votes
4 answers
How to define a static array without a contant size in a constructor of a class? (C++)
I have a class defined as:
class Obj {
public:
int width, height;
Obj(int w, int h);
}
and I need it to contain a static array like so:
int presc[width][height];
however, I cannot define within the class, so it it possible to create a…
user98188
3
votes
3 answers
Strange behavior adding this object to this static array
At the moment I test with this piece of code:
type = $type;
…
Ron van der Heijden
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