Boost.Hana  1.2.0 Your standard library for metaprogramming
sum.hpp File Reference

Forward declares boost::hana::sum. More...

## Namespaces

boost::hana
Namespace containing everything in the library.

## Variables

constexpr auto boost::hana::sum = see documentation
Compute the sum of the numbers of a structure.More generally, sum will take any foldable structure containing objects forming a Monoid and reduce them using the Monoid's binary operation. The initial state for folding is the identity of the Monoid. It is sometimes necessary to specify the Monoid to use; this is possible by using sum<M>. If no Monoid is specified, the structure will use the Monoid formed by the elements it contains (if it knows it), or integral_constant_tag<int> otherwise. Hence,. More...

## Detailed Description

Forward declares boost::hana::sum.