find.md

hal::find_if

Return the index of the first element that matches some predicate.

template <typename UnaryOp, typename... Elements>
std::size_t find_if(UnaryOp&& predicate, Elements&&... elements);

predicate is any callable accepting a single element and returning a type convertible to bool. The return value index is zero based, will return sizeof...(Elements...) if no match is found.

✔️ hal::reverse::find_if(...)

❌ Modifying Algorithm

hal::find_if_not

Return the index of the first element that does not match some predicate.

template <typename UnaryOp, typename... Elements>
std::size_t find_if_not(UnaryOp&& predicate, Elements&&... elements)

predicate is any callable accepting a single element and returning a type convertible to bool. predicate is used as if it is wrapped in std::not_fn to find a true result. The return value index is zero based, will return sizeof...(Elements...) if no match is found.

✔️ hal::reverse::find_if_not(...)

❌ Modifying Algorithm

hal::find

Return the index of the first element that is equal to a given object.

template <typename T, typename... Elements>
std::size_t find(T&& x, Elements&&... elements);

Uses operator== to perform the equality check for each element against parameter x, until a match is found. The return value index is zero based, will return sizeof...(Elements...) if no match is found.

✔️ hal::reverse::find(...)

❌ Modifying Algorithm

Examples