where / where_with_index

Filters a sequence. More...

Functions
template<typename Pred >
auto	coveo::linq::where (Pred &&pred) -> detail::where_impl< detail::indexless_selector_proxy< Pred >>
	Filters sequence elements using predicate. More...
template<typename Pred >
auto	coveo::linq::where_with_index (Pred &&pred) -> detail::where_impl< Pred >
	Filters sequence elements using predicate and element index. More...

Detailed Description

The where operator (and its siblings) filter the elements in a sequence, returning a new sequence containing only the elements that satisfy a predicate.

.NET equivalent: Where

Function Documentation

where()

template<typename Pred >

auto coveo::linq::where

(

Pred &&

pred

)

-> detail::where_impl<detail::indexless_selector_proxy<Pred>>

Returns a sequence that contains only the elements from the source sequence that satisfy the given predicate. Order of the elements is preserved.

Use like this:

const int NUMS[] = { 42, 23, 66, 11, 7 };

using namespace coveo::linq;
auto seq = from(NUMS)
         | where([](int i) { return i % 2 != 0; });
// seq = { 23, 11, 7 }

Parameters

pred	Predicate to satisfy.

Returns

(Once applied) Sequence containing all elements from source sequence for which pred returned true.

where_with_index()

template<typename Pred >

auto coveo::linq::where_with_index

(

Pred &&

pred

)

-> detail::where_impl<Pred>

Returns a sequence that contains only the elements from the source sequence that satisfy the given predicate. Order of the elements is preserved.

The predicate receives two arguments: a sequence element and its position in the sequence.

Use like this:

const int NUMS[] = { 42, 23, 66, 11, 7 };

using namespace coveo::linq;
auto seq = from(NUMS)
         | where_with_index([](int i, std::size_t idx) { return i % 2 != 0 || idx == 0; });
// seq = { 42, 23, 11, 7 }

Parameters

pred	Predicate to satisfy.

Returns

(Once applied) Sequence containing all elements from source sequence for which pred returned true.