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units::common_quantity_t documentation added

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Mateusz Pusz
2019-05-07 21:54:23 -06:00
parent cf2370b8fe
commit a80001c745
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doc/DESIGN.md
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@@ -261,6 +261,13 @@ public:
Additional functions provide the support for operations that result in a different dimension type
than those of their arguments.
Another change comparing to `std::chrono::duration` is that the `duration` is using
`std::common_type_t<Rep1, Rep2>` to find a common representation for a calculation result. Such
a design was reported as problematic by numerics study group members as sometimes we want to provide
a different type in case of multiplication and different in case of division. `std::common_type` lacks
that additional information. That is why `units::quantity` uses the resulting type of a concrete operator
operation and provides it directly to `units::common_quantity_t` type trait.
#### `quantity_cast`
To explicitly force truncating conversions `quantity_cast` function is provided which is a direct