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HTTP/1.1 301 Moved Permanently Server: nginx Date: Tue, 22 Jul 2025 08:27:07 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Location: /reference/valarray/indirect_array/ HTTP/1.1 200 OK Server: nginx Date: Tue, 22 Jul 2025 08:27:07 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive ETag: W/"7b9b-y+WPRdrnUdkGOkAWsDRGBxtWJUQ" Content-Encoding: gzip

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C++

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Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<valarray>

classes
- gslice
- gslice_array
- indirect_array
- mask_array
- slice
- slice_array
- valarray
functions
- abs
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- asin
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- atan2
- cos
- cosh
- exp
- log
- log10
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- sin
- sinh
- sqrt
- tan
- tanh

Reference
<valarray>
indirect_array

class template

std::indirect_array

template <class T> indirect_array;

Valarray indirect selection

This class is used as an intermediate type returned by valarray's subscript operator (operator[]) when used with a valarray of indices.

It references the elements from the valarray whose index is included in the object passed to the subscript operator.

The type is convertible to a valarray (see valarray constructor), producing a new object with copies of the referred elements.

Objects of this type are obtained as the return value of a call to valarray::operator[]. They cannot be directly constructed nor copied. It is declared as:

template <class T> class indirect_array {
public:
  typedef T value_type;
  void operator=   (const valarray<T>&) const;
  void operator*=  (const valarray<T>&) const;
  void operator/=  (const valarray<T>&) const;
  void operator%=  (const valarray<T>&) const;
  void operator+=  (const valarray<T>&) const;
  void operator-=  (const valarray<T>&) const;
  void operator^=  (const valarray<T>&) const;
  void operator&=  (const valarray<T>&) const;
  void operator|=  (const valarray<T>&) const;
  void operator<<= (const valarray<T>&) const;
  void operator>>= (const valarray<T>&) const;
  void operator=(const T&);
  ~indirect_array();
private:
  indirect_array();
  indirect_array(const indirect_array&);
  indirect_array& operator= (const indirect_array&);
};

Objects of this type are obtained as the return value of a call to valarray::operator[]. They cannot be default-constructed, but can be copied. It is declared as:

template <class T> class indirect_array {
public:
  typedef T value_type;
  void operator=   (const valarray<T>&) const;
  void operator*=  (const valarray<T>&) const;
  void operator/=  (const valarray<T>&) const;
  void operator%=  (const valarray<T>&) const;
  void operator+=  (const valarray<T>&) const;
  void operator-=  (const valarray<T>&) const;
  void operator^=  (const valarray<T>&) const;
  void operator&=  (const valarray<T>&) const;
  void operator|=  (const valarray<T>&) const;
  void operator<<= (const valarray<T>&) const;
  void operator>>= (const valarray<T>&) const;
  void operator=(const T&);
  indirect_array() = delete;
  indirect_array(const gslice_array&);
  const indirect_array& operator= (const indirect_array&) const;
  ~indirect_array();
};

Example

// indirect_array example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <valarray>     // std::valarray
int main ()
{
  std::valarray<int> foo (8);
  for (int i=0; i<8; ++i) foo[i]=i;             //  0  1  2  3  4  5  6  7
  std::size_t sel[] = {3,5,6};
  std::valarray<std::size_t> selection (sel,3); //           *     *  *
  foo[selection] *= std::valarray<int>(10,3);   //  0  1  2 30  4 50 60 7
  foo[selection] = 0;                           //  0  1  2  0  4  0  0 7
  std::cout << "foo:";
  for (std::size_t i=0; i<foo.size(); ++i)
    std::cout << ' ' << foo[i];
  std::cout << '\n';
  return 0;
}

Output:


foo: 0 1 2 0 4 0 0 7

classes

functions

std::indirect_array

Example

See also