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281 lines
8.7 KiB
281 lines
8.7 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: comstl/util/DECIMAL_functions.h
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*
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* Purpose: DECIMAL helper functions.
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*
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* Created: 23rd August 2008
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* Updated: 10th August 2009
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*
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* Home: http://stlsoft.org/
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*
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* Copyright (c) 2008-2009, Matthew Wilson and Synesis Software
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
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* any contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* ////////////////////////////////////////////////////////////////////// */
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/** \file comstl/util/DECIMAL_functions.h
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*
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* \brief [C++ only; requires COM] DECIMAL helper functions
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* (\ref group__library__utility__com "COM Utility" Library).
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*/
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#ifndef COMSTL_INCL_COMSTL_UTIL_H_DECIMAL_FUNCTIONS
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#define COMSTL_INCL_COMSTL_UTIL_H_DECIMAL_FUNCTIONS
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# define COMSTL_VER_COMSTL_UTIL_H_DECIMAL_FUNCTIONS_MAJOR 1
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# define COMSTL_VER_COMSTL_UTIL_H_DECIMAL_FUNCTIONS_MINOR 0
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# define COMSTL_VER_COMSTL_UTIL_H_DECIMAL_FUNCTIONS_REVISION 2
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# define COMSTL_VER_COMSTL_UTIL_H_DECIMAL_FUNCTIONS_EDIT 3
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#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* Includes
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*/
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#ifndef COMSTL_INCL_COMSTL_H_COMSTL
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# include <comstl/comstl.h>
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#endif /* !COMSTL_INCL_COMSTL_H_COMSTL */
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#ifndef STLSOFT_INCL_H_OAIDL
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# define STLSOFT_INCL_H_OAIDL
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# include <oaidl.h>
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#endif /* !STLSOFT_INCL_H_OAIDL */
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#ifndef STLSOFT_INCL_H_WTYPES
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# define STLSOFT_INCL_H_WTYPES
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# include <wtypes.h>
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#endif /* !STLSOFT_INCL_H_WTYPES */
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#if !defined(_COMSTL_NO_NAMESPACE) && \
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!defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
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# if defined(_STLSOFT_NO_NAMESPACE)
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/* There is no stlsoft namespace, so must define ::comstl */
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namespace comstl
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{
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# else
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/* Define stlsoft::comstl_project */
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namespace stlsoft
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{
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namespace comstl_project
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{
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# endif /* _STLSOFT_NO_NAMESPACE */
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#endif /* !_COMSTL_NO_NAMESPACE */
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/* /////////////////////////////////////////////////////////////////////////
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* C functions
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*/
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/** \brief [C only] Compares two DECIMAL structures
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*
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* \ingroup group__library__utility__com
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*
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* \param lhs Pointer to the left-hand instances to compare
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* \param lhs Pointer to the right-hand instances to compare
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*
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* \pre \c lhs must not be NULL.
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* \pre \c rhs must not be NULL.
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*/
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STLSOFT_INLINE int comstl__DECIMAL_compare(DECIMAL const* lhs, DECIMAL const* rhs)
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{
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COMSTL_MESSAGE_ASSERT("Cannot pass NULL pointer(s) to DECIMAL_compare()", (NULL != lhs && NULL != rhs));
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COMSTL_MESSAGE_ASSERT("invalid sign value in lhs", (0 == lhs->sign || DECIMAL_NEG == lhs->sign));
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COMSTL_MESSAGE_ASSERT("invalid sign value in rhs", (0 == rhs->sign || DECIMAL_NEG == rhs->sign));
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if(lhs->sign != rhs->sign)
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{
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/* signs are different, so we need only check for both being 0,
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* otherwise just return indication of which is -ve
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*/
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if( 0 == lhs->Hi32 &&
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0 == rhs->Hi32 &&
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0 == lhs->Mid32 &&
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0 == rhs->Mid32 &&
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0 == lhs->Lo32 &&
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0 == rhs->Lo32)
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{
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return 0;
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}
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else
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{
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if(0 != lhs->sign)
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{
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/* lhs is negative, and rhs is not, so lhs is less */
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return -1;
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}
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else
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{
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return +1;
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}
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}
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}
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else
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{
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/* next see if scale is the same */
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if(lhs->scale != rhs->scale)
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{
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/* This is too-hard, so we convert to VARIANTS and do the check
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* that way
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*/
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VARIANT vdecL;
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VARIANT vdecR;
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VARIANT vdblL;
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VARIANT vdblR;
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VariantClear(&vdecL);
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VariantClear(&vdecR);
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VariantClear(&vdblL);
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VariantClear(&vdblR);
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COMSTL_ACCESS_VARIANT_vt_BYREF(vdecL) = VT_DECIMAL;
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COMSTL_ACCESS_VARIANT_decVal_BYREF(vdecL) = *lhs;
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COMSTL_ACCESS_VARIANT_vt_BYREF(vdecR) = VT_DECIMAL;
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COMSTL_ACCESS_VARIANT_decVal_BYREF(vdecR) = *rhs;
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VariantChangeType(&vdblL, &vdecL, 0, VT_R8);
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VariantChangeType(&vdblR, &vdecR, 0, VT_R8);
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if(COMSTL_ACCESS_VARIANT_MEM_BYREF(vdblL, dblVal) == COMSTL_ACCESS_VARIANT_MEM_BYREF(vdblR, dblVal))
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{
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return 0;
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}
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else if(COMSTL_ACCESS_VARIANT_MEM_BYREF(vdblL, dblVal) < COMSTL_ACCESS_VARIANT_MEM_BYREF(vdblR, dblVal))
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{
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return -1;
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}
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else
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{
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return +1;
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}
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}
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else
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{
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/* scale is the same, so compare Hi32 first */
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if(lhs->Hi32 != rhs->Hi32)
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{
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return (lhs->Hi32 < rhs->Hi32) ? -1 : +1;
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}
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else
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{
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if(lhs->Mid32 != rhs->Mid32)
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{
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return (lhs->Mid32 < rhs->Mid32) ? -1 : +1;
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}
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else
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{
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if(lhs->Lo32 != rhs->Lo32)
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{
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return (lhs->Lo32 < rhs->Lo32) ? -1 : +1;
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}
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else
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{
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return 0;
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}
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}
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}
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}
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}
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}
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#ifdef STLSOFT_DOCUMENTATION_SKIP_SECTION
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namespace comstl
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{
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#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* C++ functions
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*/
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#ifdef __cplusplus
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/** \brief [C++ only] Compares two DECIMAL structures
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*
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* \ingroup group__library__utility__com
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*
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* \param lhs Pointer to the left-hand instances to compare
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* \param lhs Pointer to the right-hand instances to compare
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*
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* \pre \c lhs must not be NULL.
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* \pre \c rhs must not be NULL.
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*/
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inline int DECIMAL_compare(DECIMAL const* lhs, DECIMAL const* rhs)
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{
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return comstl__DECIMAL_compare(lhs, rhs);
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}
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/** \brief [C++ only] Compares two DECIMAL structures
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*
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* \ingroup group__library__utility__com
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*
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* \param lhs Reference to the left-hand instances to compare
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* \param lhs Reference to the right-hand instances to compare
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*/
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inline int DECIMAL_compare(DECIMAL const& lhs, DECIMAL const& rhs)
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{
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return comstl__DECIMAL_compare(&lhs, &rhs);
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}
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#endif /* __cplusplus */
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/* /////////////////////////////////////////////////////////////////////////
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* Unit-testing
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*/
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#ifdef STLSOFT_UNITTEST
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# include "./unittest/DECIMAL_functions_unittest_.h"
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#endif /* STLSOFT_UNITTEST */
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/* ////////////////////////////////////////////////////////////////////// */
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#ifndef _COMSTL_NO_NAMESPACE
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# if defined(_STLSOFT_NO_NAMESPACE) || \
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defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
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} /* namespace comstl */
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# else
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} /* namespace comstl_project */
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} /* namespace stlsoft */
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# endif /* _STLSOFT_NO_NAMESPACE */
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#endif /* !_COMSTL_NO_NAMESPACE */
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/* ////////////////////////////////////////////////////////////////////// */
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#endif /* !COMSTL_INCL_COMSTL_UTIL_H_DECIMAL_FUNCTIONS */
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/* ///////////////////////////// end of file //////////////////////////// */
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