Class template apply_visitor_delayed_cpp14_t

boost::apply_visitor_delayed_cpp14_t — Adapts a visitor for use as a function object.

Synopsis

// In header: <boost/variant/apply_visitor.hpp>

template<typename Visitor> 
class apply_visitor_delayed_cpp14_t {
public:
  // construct/copy/destruct
  explicit apply_visitor_delayed_cpp14_t(Visitor &);

  // function object interface
  template<typename ... Variant> decltype(auto) operator()(Variant&...);
};

Description

Adapts the function given at construction for use as a function object. This is useful, for example, when one needs to operate on each element of a sequence of variant objects using a standard library algorithm such as std::for_each.

See the "visitor-only" form of apply_visitor for a simple way to create apply_visitor_delayed_t objects.

See apply_visitor_delayed_t which is used when Visitor has result_type typedef.

Available only if macro BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES is not defined and compiler supports decltype(auto) and decltype(some-expression).

`apply_visitor_delayed_cpp14_t` public construct/copy/destruct

```
explicit apply_visitor_delayed_cpp14_t(Visitor & visitor);
```
Effects:
Constructs the function object with the given visitor.

`apply_visitor_delayed_cpp14_t` function object interface

```
template<typename ... Variant> decltype(auto) operator()(Variant&... operand);
```
Function call operator.
Invokes apply_visitor on the stored visitor using the given operands.

Boost C++ Libraries