[#mp_units-quantity_spec-0a0-_is_non_negative_]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_spec-0a0.adoc[quantity_spec<QS, Eq, Args...>]::_is_non_negative_
:relfileprefix: ../../
:mrdocs:

Whether quantities of this specification can never hold a negative value

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
inline constexpr static
bool _is_non_negative_ = mp_units::contains<struct non_negative, Args...>() || (!mp_units::contains<struct possibly_negative, Args...>() &&
                                                           _character_ == quantity_character{} && QS._is_non_negative_);
----


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