filter_map()

template<template< typename... > class Filter, typename F , typename T , require_tuple_t< T > * = nullptr>

constexpr decltype(auto) stan::math::filter_map ( F &&  f, T &&  x  )

inlineconstexpr

Filter a tuple and apply a functor to each element that passes the filter.

Note

The Filter will only check T and if T is a tuple, it will recursively check each element of the tuple. But it will not inspect into std::vector elements automatically. If you want to inspect the inner element of an std::vector your type trait must do that itself.

Template Parameters

Filter	a struct that accepts one template parameter and has a static constexpr bool member named value that is true if the type should be included in the output tuple.
F	Type of functor
T	A tuple

Parameters

f	functor callable
x	tuple of arguments

Returns

a tuple with the functor applied to each element which passed the filter.

Definition at line 154 of file filter_map.hpp.