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

Synopsis

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

[[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

Name Description

from

source unit

to

target unit

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