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Showing content from https://cplusplus.com/array::data below:

public member function

<array>

std::array::data 
      value_type* data() noexcept;const value_type* data() const noexcept;

Get pointer to data

Returns a pointer to the first element in the array object.

Because elements in the array are stored in contiguous storage locations, the pointer retrieved can be offset to access any element in the array.



Parameters none

Return Value Pointer to the data contained by the array object.

If the array object is const-qualified, the function returns a pointer to const value_type. Otherwise, it returns a pointer to value_type.

Member type value_type is the type of the elements in the container, defined in array as an alias of its first template parameter (T).



Example 
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// array::data
#include <iostream>
#include <cstring>
#include <array>

int main ()
{
  const char* cstr = "Test string";
  std::array<char,12> charray;

  std::memcpy (charray.data(),cstr,12);

  std::cout << charray.data() << '\n';

  return 0;
}

Output:


Complexity Constant.

Iterator validity No changes.

Data races No contained elements are directly accessed by the call, but the pointer returned can be used to access or modify elements. Concurrently accessing or modifying different elements is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
array::begin
Return iterator to beginning (public member function)
array::front
Access first element (public member function)
array::operator[]
Access element (public member function)
array::fill
Fill array with value (public member function)

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