bbldc_basicisda11.h

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/// @file bbldc_basicisda11.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// bbldc_basicisda11.h                                                -*-C++-*-
#ifndef INCLUDED_BBLDC_BASICISDA11
#define INCLUDED_BBLDC_BASICISDA11
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup bbldc_basicisda11 bbldc_basicisda11
/// @brief  Provide stateless functions for the ISDA 1/1 convention.
/// @addtogroup bbl
/// @{
/// @addtogroup bbldc
/// @{
/// @addtogroup bbldc_basicisda11
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#bbldc_basicisda11-purpose"> Purpose</a>
/// * <a href="#bbldc_basicisda11-classes"> Classes </a>
/// * <a href="#bbldc_basicisda11-description"> Description </a>
///   * <a href="#bbldc_basicisda11-usage"> Usage </a>
///     * <a href="#bbldc_basicisda11-example-1-computing-day-count-and-year-fraction"> Example 1: Computing Day Count and Year Fraction </a>
///
/// # Purpose {#bbldc_basicisda11-purpose}
/// Provide stateless functions for the ISDA 1/1 convention.
///
/// # Classes {#bbldc_basicisda11-classes}
///
/// -  bbldc::BasicIsda11: ISDA 1/1 stateless functions
///
/// # Description {#bbldc_basicisda11-description}
/// This component provides a `struct`, `bbldc::BasicIsda11`, 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
/// ISDA 1/1 day-count convention.  In this day-count convention, the day count
/// and year fraction between two dates is one if the second date is later than
/// the first, zero if equal, and negative one if the first date is later than
/// the second.
///
/// ## Usage {#bbldc_basicisda11-usage}
///
///
/// This section illustrates intended use of this component.
///
/// ### Example 1: Computing Day Count and Year Fraction {#bbldc_basicisda11-example-1-computing-day-count-and-year-fraction}
///
///
/// The following snippets of code illustrate how to use `bbldc::BasicIsda11`
/// methods.  First, create two `bdlt::Date` variables, `d1` and `d2`:
/// @code
/// const bdlt::Date d1(2003, 10, 19);
/// const bdlt::Date d2(2003, 12, 31);
/// @endcode
/// Then, compute the day count between the two dates:
/// @code
/// const int daysDiff = bbldc::BasicIsda11::daysDiff(d1, d2);
/// assert(1 == daysDiff);
/// @endcode
/// Finally, compute the year fraction between the two dates:
/// @code
/// const double yearsDiff = bbldc::BasicIsda11::yearsDiff(d1, d2);
/// assert(1.0 == yearsDiff);
/// @endcode
/// @}
/** @} */
/** @} */
 
/** @addtogroup bbl
 * @{
 */
/** @addtogroup bbldc
 * @{
 */
/** @addtogroup bbldc_basicisda11
 * @{
 */
 
#include <bblscm_version.h>
 
#include <bdlt_date.h>
 
 
namespace bbldc {
 
                       // ============================
                       // struct BasicIsda11
                       // ============================
 
/// This `struct` provides a namespace for a suite of pure functions that
/// compute values based on dates according to the ISDA 1/1 day-count
/// convention.
///
/// See @ref bbldc_basicisda11 
struct BasicIsda11 {
 
    // CLASS METHODS
 
    /// Return the (signed) number of days between the specified `beginDate`
    /// and `endDate` according to the ISDA 1/1 day-count convention.  If
    /// `beginDate < endDate`, then the result is one.    If `beginDate == endDate`, then the result is zero.  
    /// 
    /// \note 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 ISDA 1/1 day-count
    /// convention.  If `beginDate < endDate`, then the result is one.  If `beginDate == endDate`, then the result is zero.  
    /// 
    /// \note 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 BasicIsda11
                           // ------------------
 
// CLASS METHODS
inline
double BasicIsda11::yearsDiff(const bdlt::Date& beginDate,
                              const bdlt::Date& endDate)
{
    return beginDate < endDate ? 1.0 : beginDate == endDate ? 0.0 : -1.0;
}
 
inline
int BasicIsda11::daysDiff(const bdlt::Date& beginDate,
                                    const bdlt::Date& endDate)
{
    return beginDate < endDate ? 1 : beginDate == endDate ? 0 : -1;
}
 
}  // close package namespace
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2025 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 ----------------------------------
 
/** @} */
/** @} */
/** @} */