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
-1
votes
4 answers
Range based for with multi-dimensional std::array
Tried looking around for this but only found examples using built in array not std::array obj.
// array arr of size 5
array< array, 10> arr = { 0 };
srand((unsigned)time(0));
// initialize elements
for ()
{
for()
{
item =…
Alvaromon
- 190
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- 16
-1
votes
2 answers
How should I construct a smaller std::array as a slice of a larger one?
I want to represent elements i through i+k-1 of an std::array as another std::array, for constexpr i and k - preferably with no copying and in a constexpr function.
Can this be done? If so, what's the right way to approach this?
einpoklum
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-2
votes
1 answer
Is it possible to use values in an array for implicit aggregate initialization/assignment of a struct?
I have a struct
struct RGB {
int r;
int g;
int b;
}
I know that aggregate initialization can be used:
RGB rgb = {255, 255, 255};
I wonder if it is possible to assign an array to it. I've tried these solutions and they do not work:
int…
Delique Allen
- 13
- 3
-2
votes
1 answer
question about bounds checking inside standard containers
i have written a function that returns the data at an index for a simple implementation of an array type similar to std::array.
constexpr const T& at(size_t index) const
{
if(index < Size)
return data_[index];
throw std::out_of_range ("Index…
Adrian Costin
- 418
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- 12
-2
votes
1 answer
Cannot create constructor with std::array as class member
Here the code
#include "card.h"
#include
constexpr int DECK_SIZE = 52;
class Deck {
std::array m_deck;
public:
Deck();
~Deck() = default;
Card getCard(int index) { return m_deck[index]; }
};
Card is just…
JohnDoe
- 179
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votes
2 answers
What's wrong in this snippet?
I have no idea what's wrong with this snippet. I'm getting this error:
error: member function 'swap' not viable: 'this' argument has type 'const array', but function is not marked const
#include
#include
#include…
Dean
- 6,610
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-3
votes
1 answer
Strange outputs of std::to_string in C++11
I have this small snippet of C++ code:
#include
#include
#include
int main()
{
std::string name = "mario";
std::cerr << "Hello world! " + name + "\n";
std::array arr = {12, 12.3, 13, 14};
std::cerr <<…
kmario23
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-4
votes
3 answers
Why there is no operator-> in std::array
I am writing a std::array class as a little exercise, during which I found out that std::array does not implement operator->.
Thus for arrays the following is allowed
struct S { int s; };
S c[2];
c->s = 2;
but for std::array this is not…
tommsch
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- 19
-4
votes
1 answer
Why did STL made a(nother) distinction between a std::array and a std::initializer_list
Why is there not only 1 type with the best performance, to define a list at compile time?
The benchmark is clear, the constexpr std::initializer_list is faster, uses even less memory and the IO-reads are astonishingly less over constexpr…
jaques-sam
- 2,578
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-4
votes
2 answers
Initialize map with pair of std::arrays c++11
I would like to compile this lines. Insert to map pair of std::arrays.
#include
#include
-4
votes
2 answers
2-Dimensional std::array woes
I thought I liked the idea of std::array from C++11, but it looks like it has some quarks. I found this out because the following code gives a segmentation fault:
#include
#include
int main() {
std::array
Sammaron
- 196
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-5
votes
1 answer
How to fix compiler error when try to initialise a std::array from a non const size
I know I can use a vector, but I don't need the extra features of a vector so wanted to use a std::array. The problem I have is that I get the size of the array from the user - from stdin. Then I know the size and initialise the array from…
Angus Comber
- 9,316
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-9
votes
1 answer
What variations of vector-like containers already widely established? Do I have to write my own?
In my program, I often need an owning array-like container - i.e. for data stored contiguously in memory, but vector is too flexible and less practical or efficient than it could be.
The requirements differ from std::vector in one or more aspects…
einpoklum
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