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

Add to this time interval the specified `duration`. Return a reference providing modifiable access to this object. The behavior is undefined unless the `duration` can be converted to a valid `TimeInterval` object, whose `seconds` field may have any 64‐bit signed integer value and `nanoseconds` field limited to the range `[ ‐999,999,999..999,999,999 ]`. Also the behavior is undefined unless the total number of seconds in the resulting time interval can be represented with 64‐bit signed integer. Note that this operation is allowed only if representation type of the `duration` is not a floating point type and the `duration` itself can be _exactly_ represented by an integer nanoseconds.

== Synopsis

Declared in `<bsls_timeinterval.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class REP_TYPE,
    class PERIOD_TYPE>
constexpr
xref:BloombergLP/bsls/TimeInterval.adoc[TimeInterval]&
addDuration(
    std::chrono::duration<REP_TYPE, PERIOD_TYPE> const& duration,
    int* = 0)
requires TimeInterval_DurationTraits<REP_TYPE, PERIOD_TYPE>::
                                                 k_IMPLICIT_CONVERSION_ENABLED;
----


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