folly::gen::detail::First Class Reference

#include <Base-inl.h>

Inheritance diagram for folly::gen::detail::First:

Public Member Functions
	First ()=default
template<class Source , class Value , class StorageType = typename std::decay<Value>::type>
Optional< StorageType >	compose (const GenImpl< Value, Source > &source) const
Public Member Functions inherited from folly::gen::Operator< First >
ResultGen	compose (const GenImpl< Value, Source > &source) const
Public Member Functions inherited from folly::gen::FBounded< Self >
const Self &	self () const
Self &	self ()

Additional Inherited Members
Protected Member Functions inherited from folly::gen::Operator< First >
	Operator ()=default
	Operator (Operator &&) noexcept=default
	Operator (const Operator &)=default
Operator &	operator= (Operator &&) noexcept=default
Operator &	operator= (const Operator &)=default

Detailed Description

First - For finding the first value in a sequence.

This type is primarily used through the 'first' static value, like:

int firstThreeDigitPrime = seq(100) | filter(isPrime) | first;

Definition at line 2031 of file Base-inl.h.

Constructor & Destructor Documentation

folly::gen::detail::First::First ( )

default

Member Function Documentation

template<class Source , class Value , class StorageType = typename std::decay<Value>::type>

Optional<StorageType> folly::gen::detail::First::compose ( const GenImpl< Value, Source > &  source ) const

inline

Definition at line 2039 of file Base-inl.h.

References v.

Referenced by folly::gen::detail::Composed< First, Second >::compose().

                                                                            {
    Optional<StorageType> accum;
    source | [&](Value v) -> bool {
      accum = std::forward<Value>(v);
      return false;
    };
    return accum;
  }

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The documentation for this class was generated from the following file:

• proxygen/folly/folly/gen/Base-inl.h