std::array is a container that encapsulates constant size arrays in C++.
std::array is a part of the C++ Standard Library since C++11.
Reference: https://en.cppreference.com/w/cpp/container/array
Questions tagged [stdarray]
433 questions
0
votes
3 answers
Initialization of std::array with std::initializer_list in constructor's initialization list
Consider the following piece of code:
struct foo {
std::vector v;
foo(std::initializer_list L) : v{L} {}
};
The code above compiles fine and initializes v as expected. Now consider the following piece of code:
struct bar {
…
101010
- 41,839
- 11
- 94
- 168
0
votes
2 answers
Indexing into std::array of std::array
I have some confusion about indexing of an array of arrays in C++:
I have:
array, SIZE_OUTER> arr;
When I do indexing, I assume the following:
arr[outer_index][inner_index]
So, outer_index into the array with SIZE_OUTER…
Michael
- 7,407
- 8
- 41
- 84
0
votes
1 answer
Efficient way to convert/reinterpret vector as vector>
I want to call a method (template) that takes a vector>& with the result from another method that returns a vector
Is there a efficient (O(1)) way to reinterpret a vector as a vector>? Is it possible / safe to…
b.buchhold
- 3,837
- 2
- 24
- 33
0
votes
0 answers
Passing 2d std::array to function c++
I'm trying to pass to a constructor class a 2d array
std::array, dimension>
I do some search, and i tried to use the template.. But doesn't work
But, my code produce the following error :
Undefined symbols for…
Pusheen_the_dev
- 2,077
- 4
- 17
- 33
0
votes
1 answer
std::array vs C-array vs std:vector
i thought to replace std::vector with std::array in my program, so i went on testing:
template class A{
public:
void sub_run(T w){
w[0] = 0.5;
w[1] = 1.5;
w[2] = 2.5;
w[3] = 0.0;
for (int…
stkubr
- 371
- 1
- 5
- 15
0
votes
1 answer
Pr oblems Accessing Certain Class Functions C++ from Vector
I have a vector of type Tab, but when I call class functions on the vector of Tabs I get no output. However, I don't receive any errors either.
If you know what an Android launcher is, then this is supposed to be a simple console-based testcase of…
Andrue
- 688
- 3
- 11
- 27
0
votes
2 answers
Template class in std::array
Is it possible to add a template class inside std::array without specifying the typename? I mean.
template
class MyClass
{
...
}
std::array arr;
The reason is that I have a kind of storage that accepts all classes that…
yayuj
- 2,194
- 3
- 17
- 29
0
votes
3 answers
Getting the second argument (size) of std::array as a function argument
In the following code, I need to get size of the std::array as a function argument. I preferred std::array to std::vector since the size of the container is not supposed to change. However, the compiler complains as error: ‘n’ is not a constant…
Shibli
- 5,879
- 13
- 62
- 126
0
votes
2 answers
Initialize std::array with implied length
In C you can do int a[] = {1,2,3,4,5}, but C++11 std::array a = {1,2,3,4,5} will give a "too few template parameters" compile error. Any way around this?
jcai
- 3,448
- 3
- 21
- 36
0
votes
3 answers
Return 2d array from C++
Inside a function, I make a 2d array that fills itself from a text file and needs to get returned to main. The array stays a constant size through the whole program.
I know this is something that gets asked a lot, but I always seem to get one of two…
JTTCOTE
- 1
- 1
- 2
-1
votes
1 answer
Is calling x = std::array () same as declaring std::array x?
I am writing custom move constructor and move assignment operator for class_name. I would like to know if calling std::array as std::array () is correct or not.
class_name::class_name(class_name&& other) :
mem_A(std::exchange(other.memA,…
TeenyTinySparkles
- 409
- 3
- 20
-1
votes
1 answer
Error when using a custom function to sort a vector of arrays
This is my code:
#include
#include
#include
#include
using namespace std;
bool compareel (int a[], int b[])
{
return (a[2] < b[2]);
}
int main ()
{
vector < array < int, 3 >> edges = { {1, 2, 3}, {2,…
Phy_student
- 11
-1
votes
1 answer
Why can I create a vector of std::array?
I thought that you should always determine what the size of an array is at compile time. I thought this was the case because a specific amount of memory would be allocated for that array.
Then, why is this not a…
Daniel Duque
- 159
- 9
-1
votes
1 answer
Turn multidimensional c++ std::array into multidimensional vector
I have a multidimensional c++ std::array (i don't know how many dimensions does it have), and i want to turn it into a multidimensional vector. I thought at a function that returns a vector if a std::array is passed, else throws error. I am pretty…
Giuppox
- 1,393
- 9
- 35
-1
votes
1 answer
/usr/include/c++/7.3.0/bits/predefined_ops.h:283:11: error: expression cannot be used as a function
I have the following minimal example:
#include
#include
#include
enum my_enum {
onething,
otherthing
};
int main(int argc, char const *argv[]) {
std::array a_variable;
if…
Max Matti
- 352
- 1
- 4
- 17