[#mp_units-quantity-01-2constructor-0f0]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::quantity
:relfileprefix: ../../
:mrdocs:

Deleted overload that rejects truncating conversions when constructing without a reference.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename Value>
requires detail::ExplicitFromNumber<reference> && (!detail::RepConstructibleFrom<rep, Value>)
constexpr
explicit(!std::convertible_to<Value, rep> || !mp_units::implicitly_convertible(quantity_spec, dimensionless))
quantity(Value val) = delete;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| the numerical value that would be truncated when converted to `rep`
|===


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