bbldc_basicactual360.h

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/// @file bbldc_basicactual360.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// bbldc_basicactual360.h                                             -*-C++-*-
#ifndef INCLUDED_BBLDC_BASICACTUAL360
#define INCLUDED_BBLDC_BASICACTUAL360
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup bbldc_basicactual360 bbldc_basicactual360
/// @brief  Provide stateless functions for the Actual/360 convention.
/// @addtogroup bbl
/// @{
/// @addtogroup bbldc
/// @{
/// @addtogroup bbldc_basicactual360
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#bbldc_basicactual360-purpose"> Purpose</a>
/// * <a href="#bbldc_basicactual360-classes"> Classes </a>
/// * <a href="#bbldc_basicactual360-description"> Description </a>
///   * <a href="#bbldc_basicactual360-usage"> Usage </a>
///     * <a href="#bbldc_basicactual360-example-1-computing-day-count-and-year-fraction"> Example 1: Computing Day Count and Year Fraction </a>
///
/// # Purpose {#bbldc_basicactual360-purpose}
/// Provide stateless functions for the Actual/360 convention.
///
/// # Classes {#bbldc_basicactual360-classes}
///
/// -  bbldc::BasicActual360: Actual/360 convention stateless functions
///
/// # Description {#bbldc_basicactual360-description}
/// This component provides a `struct`, `bbldc::BasicActual360`,
/// that serves as a namespace for defining a suite of date-related functions
/// used to compute the day count and the year fraction between two dates as per
/// the Actual/360 day-count convention.  In this day-count convention, we
/// simply measure the number of days occurring in a time period, and to
/// calculate years, divide that by 360.  Note that this means the number of
/// years between January 1, 2005 and January 1, 2006 is about 1.0139.  No
/// end-of-month rule adjustments are made.  Given `beginDate` and `endDate`:
/// @code
/// yearsDiff ::= sign(endDate - beginDate) *
///                                (days between beginDate and endDate) / 360.0
/// @endcode
///
/// ## Usage {#bbldc_basicactual360-usage}
///
///
/// This section illustrates intended use of this component.
///
/// ### Example 1: Computing Day Count and Year Fraction {#bbldc_basicactual360-example-1-computing-day-count-and-year-fraction}
///
///
/// The following snippets of code illustrate how to use `bbldc::BasicActual360`
/// methods.  First, create four `bdlt::Date` variables:
/// @code
/// const bdlt::Date dA(2004, 2, 1);
/// const bdlt::Date dB(2004, 3, 1);
/// const bdlt::Date dC(2004, 5, 1);
/// const bdlt::Date dD(2005, 2, 1);
/// @endcode
/// Then, compute the day count between some pairs of these dates:
/// @code
/// int daysDiff;
/// daysDiff = bbldc::BasicActual360::daysDiff(dA, dB);
/// assert( 29 == daysDiff);
/// daysDiff = bbldc::BasicActual360::daysDiff(dA, dC);
/// assert( 90 == daysDiff);
/// daysDiff = bbldc::BasicActual360::daysDiff(dA, dD);
/// assert(366 == daysDiff);
/// daysDiff = bbldc::BasicActual360::daysDiff(dB, dC);
/// assert( 61 == daysDiff);
/// @endcode
/// Finally, compute the year fraction between some of the dates:
/// @code
/// double yearsDiff;
/// yearsDiff = bbldc::BasicActual360::yearsDiff(dA, dC);
/// assert(0.25 == yearsDiff);
/// yearsDiff = bbldc::BasicActual360::yearsDiff(dA, dD);
/// // Need fuzzy comparison since 'yearsDiff' is a 'double'.
/// assert(yearsDiff < 1.0167 && yearsDiff > 1.0166);
/// @endcode
/// @}
/** @} */
/** @} */
 
/** @addtogroup bbl
 * @{
 */
/** @addtogroup bbldc
 * @{
 */
/** @addtogroup bbldc_basicactual360
 * @{
 */
 
#include <bblscm_version.h>
 
#include <bdlt_date.h>
 
 
namespace bbldc {
 
                          // =====================
                          // struct BasicActual360
                          // =====================
 
/// This `struct` provides a namespace for a suite of pure functions that
/// compute values based on dates according to the Actual/360 day-count
/// convention.
struct BasicActual360 {
 
    // CLASS METHODS
 
    /// Return the (signed) number of days between the specified `beginDate`
    /// and `endDate` according to the Actual/360 day-count convention.  If
    /// `beginDate <= endDate` then the result is non-negative.  Note that
    /// reversing the order of `beginDate` and `endDate` negates the result.
    static int daysDiff(const bdlt::Date& beginDate,
                        const bdlt::Date& endDate);
 
    /// Return the (signed fractional) number of years between the specified
    /// `beginDate` and `endDate` according to the Actual/360 day-count
    /// convention.  If `beginDate <= endDate` then the result is
    /// non-negative.  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`.
    static double yearsDiff(const bdlt::Date& beginDate,
                            const bdlt::Date& endDate);
};
 
// ============================================================================
//                             INLINE DEFINITIONS
// ============================================================================
 
                             // ----------------
                             // struct Actual360
                             // ----------------
 
// CLASS METHODS
inline
int BasicActual360::daysDiff(const bdlt::Date& beginDate,
                             const bdlt::Date& endDate)
{
    return endDate - beginDate;
}
 
}  // close package namespace
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2015 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------- END-OF-FILE ----------------------------------
 
/** @} */
/** @} */
/** @} */