scan

auto eve::scan = functor<scan_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
  template<simd_value Wide, eve::abelian_monoid<Wide> Op, eve::substitute_for<Wide> Zero>
  constexpr Wide scan(Wide auto x, Op op, Zero zero) noexcept;                       // 1
 
  template<simd_value Wide>
  constexpr Wide scan(Wide x) noexcept;                                              // 2
}

Parameters

• x: An instance of an SIMD value
• op: The commutative and associative binary operation to apply.
• zero: The identity/neutral element used by the operation.

Return value

1. Returns the generalized prefix sum over x using the binary operation op and the identity element zero.
2. Equivalent to eve::scan(x, eve::add, eve::zero).

Note

Given a binary operation op, a call to eve::scan is defined only if op is associative, commutative, and pure.

Example

#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide x = {1.0, 2.0, 3.0, 4.0};
 
  std::cout << "x: " << x << "\n";
  std::cout << "eve::scan(x): " << eve::scan(x) << "\n";
  std::cout << "eve::scan(x, eve::mul, eve::one): " << eve::scan(x, eve::mul, eve::one) << "\n";
}