[#BloombergLP-bbldc-PeriodDateRangeDayCountAdapter]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bbldc.adoc[bbldc]::PeriodDateRangeDayCountAdapter
:relfileprefix: ../../
:mrdocs:

This `class` provides an "adapter" from the specified `CONVENTION`, that requires a set of periods to compute the year fraction, to the `bbldc::DateRangeDayCount` protocol that can be used for determining values based on dates according to the day‐count `CONVENTION`.

== Synopsis

Declared in `<bbldc_perioddaterangedaycountadapter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class CONVENTION>
class PeriodDateRangeDayCountAdapter
    : public xref:BloombergLP/bbldc/DateRangeDayCount.adoc[DateRangeDayCount]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bbldc/DateRangeDayCount.adoc[DateRangeDayCount]`
| This `class` provides a protocol for determining values based on dates according to derived implementations of specific day‐count conventions. The methods `firstDate` and `lastDate` define a date range for which calculations are valid, to reflect the valid range of, say, a calendar required for the computations.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/2constructor-05.adoc[`PeriodDateRangeDayCountAdapter`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/2destructor.adoc[`~PeriodDateRangeDayCountAdapter`] [.small]#[destructor]# [.small]#[virtual]#
| Destroy this object.
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/allocator.adoc[`allocator`] 
| Return the allocator used by this adapter to supply memory.
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/daysDiff.adoc[`daysDiff`]  [.small]#[virtual]#
| Return the (signed) number of days between the specified `beginDate` and `endDate` as per the `CONVENTION` template policy. If `beginDate <= endDate`, then the result is non‐negative. Note that reversing the order of `beginDate` and `endDate` negates the result.
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/firstDate.adoc[`firstDate`]  [.small]#[virtual]#
| Return a reference providing non‐modifiable access to `periodDate.front()` for the `periodDate` provided at construction. Note that this value is the earliest date in the valid range of this day‐count convention adaptation.
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/lastDate.adoc[`lastDate`]  [.small]#[virtual]#
| Return a reference providing non‐modifiable access to `periodDate.back()` for the `periodDate` provided at construction. Note that this value is the latest date in the valid range of this day‐count convention adaptation.
| xref:BloombergLP/bbldc/PeriodDateRangeDayCountAdapter/yearsDiff.adoc[`yearsDiff`]  [.small]#[virtual]#
| Return the (signed fractional) number of years between the specified `beginDate` and `endDate` as per the `CONVENTION` template policy. If `beginDate <= endDate`, then the result is non‐negative. The behavior is undefined unless, for the `periodDate` provided at construction, `periodDate.front() <= beginDate <= periodDate.back()` and `periodDate.front() <= endDate <= periodDate.back()`. Note that reversing the order of `beginDate` and `endDate` negates the result; specifically, `|yearsDiff(b, e) + yearsDiff(e, b)| <= 1.0e‐15` for all dates `b` and `e`.
|===



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