GeezerVison

The World Wide Web, restored to 800 pixels of glory.

Home|About|Gaming cabinet|Archives|How it works|Starter sites

GeezerVison is showing cplusplus.com — std::valarray::sum

C++

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
- acos
- asin
- atan
- atan2
- cos
- cosh
- exp
- log
- log10
- pow
- sin
- sinh
- sqrt
- tan
- tanh

valarray

valarray::~valarray
valarray operators
valarray::valarray
member functions
non-member overloads
- C++11
  begin (valarray)
- C++11
  end (valarray)
- C++11
  swap (valarray)

public member function

<valarray>

std::valarray::sum

T sum() const;

Return sum of elements

Returns the sum of all the elements in the valarray, as if calculated by applying operator+= to a copy of one element and all the other elements, in an unspecified order.

If the valarray has a size of zero, it causes undefined behavior.

T shall support the calls to operator+=.

Parameters

none

Return value

The sum of all the elements in the valarray.
T is the template argument of valarray (the value type).

Example

// valarray::sum example
#include <iostream>     // std::cout
#include <valarray>     // std::valarray

int main ()
{
  int init[]={10,20,30,40};
  std::valarray<int> myvalarray (init,4);
  std::cout << "The sum is " << myvalarray.sum() << '\n';

  return 0;
}

Output:


The sum is 100

Complexity

Depends on library implementation (operations may be parallelized).

Iterator validity

No changes: Valid iterators, references and sub-arrays keep their validity.

Data races

Both the valarray and its elements are accessed.

Exception safety

If applying operator+= to element values throws an exception, it causes undefined behavior.
If the valarray has a size of zero, it causes undefined behavior.

See also

valarray::min: Return smallest value (public member function)

valarray::max: Return greatest value (public member function)

valarray operators: Valarray operators (function)

Home page | Privacy policy
© cplusplus.com, 2000-2026 - All rights reserved - v3.3.4s
Spotted an error? contact us

You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.