[#absl-c_inner_product-03]
= xref:absl.adoc[absl]::c_inner_product
:relfileprefix: ../
:mrdocs:

Container‐based version of the <numeric> `std::inner_product()` function to compute the cumulative inner product of container element pairs.

== Synopsis

Declared in `<absl/algorithm/container.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Sequence1,
    typename Sequence2,
    typename T>
constexpr
std::decay_t<T>
c_inner_product(
    Sequence1 const& factors1,
    Sequence2 const& factors2,
    T&& sum);
----

== Description

Note: Due to a language technicality this function has return type std::decay_t<T>. As a user of this function you can casually read this as "returns T by value" and assume it does the right thing.

== Return Value

The computed inner product.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *factors1*
| The first container of factors.
| *factors2*
| The second container of factors.
| *sum*
| The initial value of the accumulation.
|===


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