folly::gen::detail::Sum Class Reference

#include <Base-inl.h>

Inheritance diagram for folly::gen::detail::Sum:

Public Member Functions
	Sum ()=default
template<class Source , class Value , class StorageType = typename std::decay<Value>::type>
StorageType	compose (const GenImpl< Value, Source > &source) const
Public Member Functions inherited from folly::gen::Operator< Sum >
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< Sum >
	Operator ()=default
	Operator (Operator &&) noexcept=default
	Operator (const Operator &)=default
Operator &	operator= (Operator &&) noexcept=default
Operator &	operator= (const Operator &)=default

Detailed Description

Sum - For simply summing up all the values from a source.

This type is usually used through its singleton, 'sum':

auto gaussSum = seq(1, 100) | sum;

Definition at line 2151 of file Base-inl.h.

Constructor & Destructor Documentation

folly::gen::detail::Sum::Sum ( )

default

Member Function Documentation

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

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

inline

Definition at line 2159 of file Base-inl.h.

References folly::gen::foldl(), folly::gen::move, and v.

                                                                  {
    static_assert(!Source::infinite, "Cannot sum infinite source");
    return foldl(
               StorageType(0),
               [](StorageType&& accum, Value v) {
                 return std::move(accum) + std::forward<Value>(v);
               })
        .compose(source);
  }

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

• proxygen/folly/folly/gen/Base-inl.h