count_true

eve::count_true = functor<count_true_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   template<relaxed_logical_value L>
   std::ptrdiff_t count_true(L x)                                                       noexcept; // 1
 
   template<relaxed_logical_value L>
   std::ptrdiff_t count_true(top_bits<L> t)                                             noexcept; // 1
 
   // Lanes masking
   std::ptrdiff_t count_true[conditional_expr auto c](/* any of the above overloads */) noexcept; // 2
   std::ptrdiff_t count_true[logical_value auto m](/* any of the above overloads */)    noexcept; // 2
}

Parameters

• x: argument.
• t: top bits.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The number of elements in x which evaluates to true. Scalar values are treated as one element.
2. The masked version which return the number of non-masked true elements.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "<- wu0                                               = " << wu0 << "\n";
                                                                     
  std::cout << "-> count_true(wu0 <= maximum(wu0)/2)                 = " << eve::count_true(wu0 <= eve::maximum(wu0)/2) << "\n";
  std::cout << "-> count_true[ignore_last(2)](wu0 <= maximum(wu0)/2) = " << eve::count_true[eve::ignore_last(2)](wu0 <= eve::maximum(wu0)/2) << "\n";
}

Semantic Modifiers