[#CheckedLeftShift]
= CheckedLeftShift
:mrdocs:

Left bit shift with overflow checking.

== Synopsis

Declared in `<util/overflow.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<std::integral T>
constexpr
std::optional<T>
CheckedLeftShift(
    T input,
    unsigned int shift) noexcept;
----

== Return Value

(input * 2ˆshift) or nullopt if it would not fit in the return type.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The input value to be left shifted.
| *shift*
| The number of bits to left shift.
|===


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