[#BloombergLP-bsls-TimeInterval_DurationTraits]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::TimeInterval_DurationTraits
:relfileprefix: ../../
:mrdocs:

Trait metafunction that determines whether the `std::chrono::duration<REP, PERIOD>` object can be converted to `bsls::TimeInterval` either implicitly or explicitly.

== Synopsis

Declared in `<bsls_timeinterval.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class REP,
    class PERIOD>
struct TimeInterval_DurationTraits;
----

== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bsls/TimeInterval_DurationTraits/k_EXPLICIT_CONVERSION_ENABLED.adoc[`k_EXPLICIT_CONVERSION_ENABLED`] 
| This compile time constant is `true` if `std::chrono::duration<REP, PERIOD>` objects can be explicitly converted to `TimeInterval`, and `false` otherwise. This value is intended to be used with `enable_if` to enable explicitly converting function overloads. Note that this boolean value is mutually exclusive with `k_IMPLICIT_CONVERION_ENABLED` as in they will never be both `true` for the same `REP" and `PERIOD', but they may be both `false` for floats.
| xref:BloombergLP/bsls/TimeInterval_DurationTraits/k_IMPLICIT_CONVERSION_ENABLED.adoc[`k_IMPLICIT_CONVERSION_ENABLED`] 
| This compile time constant is `true` if `std::chrono::duration<REP, PERIOD>` objects will be implicitly converted to `TimeInterval`, and `false` otherwise. This value is intended to be used with `enable_if` to enable implicitly converting function overloads. Note that this boolean value is mutually exclusive with `k_EXPLICIT_CONVERION_ENABLED` as in they will never be both `true` for the same `REP" and `PERIOD', but they may be both `false` for floats.
| xref:BloombergLP/bsls/TimeInterval_DurationTraits/k_IS_FLOAT.adoc[`k_IS_FLOAT`] 
| This compile time constant is `true` if the `REP` (template type argument) is indicated to be a floating point type by the underlying library. Otherwise, if the underlying library does not consider `REP` floating point anywhere (see `TimeInterval_RepTraits`), `k_IS_FLOAT` is `false`.
| xref:BloombergLP/bsls/TimeInterval_DurationTraits/k_IS_IMPLICIT.adoc[`k_IS_IMPLICIT`] 
| This compile time constant is `true` if any possible value of an 'std::chrono::duration<REP, PERIOD> object will be represented by integer nanoseconds (fractions of nanoseconds are not required). Otherwise this value is `false`.
|===



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