[#mp_units-is_integral_scaling]
= xref:mp_units.adoc[mp_units]::is_integral_scaling
:relfileprefix: ../
:mrdocs:

Returns `true` if the scaling factor from `from` to `to` is an exact positive integer.

== Synopsis

Declared in `<mp‐units/framework/value_cast.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
consteval
bool
is_integral_scaling(
    auto from,
    auto to);
----

== Description

This is the key predicate used by the default `implicitly_scalable` to decide whether conversions between integer‐like representation types are non‐truncating (and therefore may be implicit). For example, `m → mm` has an integral factor (×1000), so integer conversions in that direction are implicit; `mm → m` has a fractional factor (÷1000), so they are explicit.

== Parameters

[cols="1,4"]
|===
|Name|Description

| *from*
| source unit
| *to*
| target unit
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#