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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/date_time/int_adapter.hpp
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+#ifndef _DATE_TIME_INT_ADAPTER_HPP__
+#define _DATE_TIME_INT_ADAPTER_HPP__
+
+/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date: 2008-11-12 14:37:53 -0500 (Wed, 12 Nov 2008) $
+ */
+
+
+#include "boost/config.hpp"
+#include "boost/limits.hpp" //work around compilers without limits
+#include "boost/date_time/special_defs.hpp"
+#include "boost/date_time/locale_config.hpp"
+#ifndef BOOST_DATE_TIME_NO_LOCALE
+# include <ostream>
+#endif
+
+namespace boost {
+namespace date_time {
+
+
+//! Adapter to create integer types with +-infinity, and not a value
+/*! This class is used internally in counted date/time representations.
+ * It adds the floating point like features of infinities and
+ * not a number. It also provides mathmatical operations with
+ * consideration to special values following these rules:
+ *@code
+ * +infinity - infinity == Not A Number (NAN)
+ * infinity * non-zero == infinity
+ * infinity * zero == NAN
+ * +infinity * -integer == -infinity
+ * infinity / infinity == NAN
+ * infinity * infinity == infinity
+ *@endcode
+ */
+template<typename int_type_>
+class int_adapter {
+public:
+ typedef int_type_ int_type;
+ int_adapter(int_type v) :
+ value_(v)
+ {}
+ static bool has_infinity()
+ {
+ return true;
+ }
+ static const int_adapter pos_infinity()
+ {
+ return (::std::numeric_limits<int_type>::max)();
+ }
+ static const int_adapter neg_infinity()
+ {
+ return (::std::numeric_limits<int_type>::min)();
+ }
+ static const int_adapter not_a_number()
+ {
+ return (::std::numeric_limits<int_type>::max)()-1;
+ }
+ static int_adapter max BOOST_PREVENT_MACRO_SUBSTITUTION ()
+ {
+ return (::std::numeric_limits<int_type>::max)()-2;
+ }
+ static int_adapter min BOOST_PREVENT_MACRO_SUBSTITUTION ()
+ {
+ return (::std::numeric_limits<int_type>::min)()+1;
+ }
+ static int_adapter from_special(special_values sv)
+ {
+ switch (sv) {
+ case not_a_date_time: return not_a_number();
+ case neg_infin: return neg_infinity();
+ case pos_infin: return pos_infinity();
+ case max_date_time: return (max)();
+ case min_date_time: return (min)();
+ default: return not_a_number();
+ }
+ }
+ static bool is_inf(int_type v)
+ {
+ return (v == neg_infinity().as_number() ||
+ v == pos_infinity().as_number());
+ }
+ static bool is_neg_inf(int_type v)
+ {
+ return (v == neg_infinity().as_number());
+ }
+ static bool is_pos_inf(int_type v)
+ {
+ return (v == pos_infinity().as_number());
+ }
+ static bool is_not_a_number(int_type v)
+ {
+ return (v == not_a_number().as_number());
+ }
+ //! Returns either special value type or is_not_special
+ static special_values to_special(int_type v)
+ {
+ if (is_not_a_number(v)) return not_a_date_time;
+ if (is_neg_inf(v)) return neg_infin;
+ if (is_pos_inf(v)) return pos_infin;
+ return not_special;
+ }
+
+ //-3 leaves room for representations of infinity and not a date
+ static int_type maxcount()
+ {
+ return (::std::numeric_limits<int_type>::max)()-3;
+ }
+ bool is_infinity() const
+ {
+ return (value_ == neg_infinity().as_number() ||
+ value_ == pos_infinity().as_number());
+ }
+ bool is_pos_infinity()const
+ {
+ return(value_ == pos_infinity().as_number());
+ }
+ bool is_neg_infinity()const
+ {
+ return(value_ == neg_infinity().as_number());
+ }
+ bool is_nan() const
+ {
+ return (value_ == not_a_number().as_number());
+ }
+ bool is_special() const
+ {
+ return(is_infinity() || is_nan());
+ }
+ bool operator==(const int_adapter& rhs) const
+ {
+ return (compare(rhs) == 0);
+ }
+ bool operator==(const int& rhs) const
+ {
+ // quiets compiler warnings
+ bool is_signed = std::numeric_limits<int_type>::is_signed;
+ if(!is_signed)
+ {
+ if(is_neg_inf(value_) && rhs == 0)
+ {
+ return false;
+ }
+ }
+ return (compare(rhs) == 0);
+ }
+ bool operator!=(const int_adapter& rhs) const
+ {
+ return (compare(rhs) != 0);
+ }
+ bool operator!=(const int& rhs) const
+ {
+ // quiets compiler warnings
+ bool is_signed = std::numeric_limits<int_type>::is_signed;
+ if(!is_signed)
+ {
+ if(is_neg_inf(value_) && rhs == 0)
+ {
+ return true;
+ }
+ }
+ return (compare(rhs) != 0);
+ }
+ bool operator<(const int_adapter& rhs) const
+ {
+ return (compare(rhs) == -1);
+ }
+ bool operator<(const int& rhs) const
+ {
+ // quiets compiler warnings
+ bool is_signed = std::numeric_limits<int_type>::is_signed;
+ if(!is_signed)
+ {
+ if(is_neg_inf(value_) && rhs == 0)
+ {
+ return true;
+ }
+ }
+ return (compare(rhs) == -1);
+ }
+ bool operator>(const int_adapter& rhs) const
+ {
+ return (compare(rhs) == 1);
+ }
+ int_type as_number() const
+ {
+ return value_;
+ }
+ //! Returns either special value type or is_not_special
+ special_values as_special() const
+ {
+ return int_adapter::to_special(value_);
+ }
+ //creates nasty ambiguities
+// operator int_type() const
+// {
+// return value_;
+// }
+
+ /*! Operator allows for adding dissimilar int_adapter types.
+ * The return type will match that of the the calling object's type */
+ template<class rhs_type>
+ inline
+ int_adapter operator+(const int_adapter<rhs_type>& rhs) const
+ {
+ if(is_special() || rhs.is_special())
+ {
+ if (is_nan() || rhs.is_nan())
+ {
+ return int_adapter::not_a_number();
+ }
+ if((is_pos_inf(value_) && rhs.is_neg_inf(rhs.as_number())) ||
+ (is_neg_inf(value_) && rhs.is_pos_inf(rhs.as_number())) )
+ {
+ return int_adapter::not_a_number();
+ }
+ if (is_infinity())
+ {
+ return *this;
+ }
+ if (rhs.is_pos_inf(rhs.as_number()))
+ {
+ return int_adapter::pos_infinity();
+ }
+ if (rhs.is_neg_inf(rhs.as_number()))
+ {
+ return int_adapter::neg_infinity();
+ }
+ }
+ return int_adapter<int_type>(value_ + rhs.as_number());
+ }
+
+ int_adapter operator+(const int_type rhs) const
+ {
+ if(is_special())
+ {
+ if (is_nan())
+ {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if (is_infinity())
+ {
+ return *this;
+ }
+ }
+ return int_adapter<int_type>(value_ + rhs);
+ }
+
+ /*! Operator allows for subtracting dissimilar int_adapter types.
+ * The return type will match that of the the calling object's type */
+ template<class rhs_type>
+ inline
+ int_adapter operator-(const int_adapter<rhs_type>& rhs)const
+ {
+ if(is_special() || rhs.is_special())
+ {
+ if (is_nan() || rhs.is_nan())
+ {
+ return int_adapter::not_a_number();
+ }
+ if((is_pos_inf(value_) && rhs.is_pos_inf(rhs.as_number())) ||
+ (is_neg_inf(value_) && rhs.is_neg_inf(rhs.as_number())) )
+ {
+ return int_adapter::not_a_number();
+ }
+ if (is_infinity())
+ {
+ return *this;
+ }
+ if (rhs.is_pos_inf(rhs.as_number()))
+ {
+ return int_adapter::neg_infinity();
+ }
+ if (rhs.is_neg_inf(rhs.as_number()))
+ {
+ return int_adapter::pos_infinity();
+ }
+ }
+ return int_adapter<int_type>(value_ - rhs.as_number());
+ }
+ int_adapter operator-(const int_type rhs) const
+ {
+ if(is_special())
+ {
+ if (is_nan())
+ {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if (is_infinity())
+ {
+ return *this;
+ }
+ }
+ return int_adapter<int_type>(value_ - rhs);
+ }
+
+ // should templatize this to be consistant with op +-
+ int_adapter operator*(const int_adapter& rhs)const
+ {
+ if(this->is_special() || rhs.is_special())
+ {
+ return mult_div_specials(rhs);
+ }
+ return int_adapter<int_type>(value_ * rhs.value_);
+ }
+ /*! Provided for cases when automatic conversion from
+ * 'int' to 'int_adapter' causes incorrect results. */
+ int_adapter operator*(const int rhs) const
+ {
+ if(is_special())
+ {
+ return mult_div_specials(rhs);
+ }
+ return int_adapter<int_type>(value_ * rhs);
+ }
+
+ // should templatize this to be consistant with op +-
+ int_adapter operator/(const int_adapter& rhs)const
+ {
+ if(this->is_special() || rhs.is_special())
+ {
+ if(is_infinity() && rhs.is_infinity())
+ {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if(rhs != 0)
+ {
+ return mult_div_specials(rhs);
+ }
+ else { // let divide by zero blow itself up
+ return int_adapter<int_type>(value_ / rhs.value_);
+ }
+ }
+ return int_adapter<int_type>(value_ / rhs.value_);
+ }
+ /*! Provided for cases when automatic conversion from
+ * 'int' to 'int_adapter' causes incorrect results. */
+ int_adapter operator/(const int rhs) const
+ {
+ if(is_special() && rhs != 0)
+ {
+ return mult_div_specials(rhs);
+ }
+ return int_adapter<int_type>(value_ / rhs);
+ }
+
+ // should templatize this to be consistant with op +-
+ int_adapter operator%(const int_adapter& rhs)const
+ {
+ if(this->is_special() || rhs.is_special())
+ {
+ if(is_infinity() && rhs.is_infinity())
+ {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if(rhs != 0)
+ {
+ return mult_div_specials(rhs);
+ }
+ else { // let divide by zero blow itself up
+ return int_adapter<int_type>(value_ % rhs.value_);
+ }
+ }
+ return int_adapter<int_type>(value_ % rhs.value_);
+ }
+ /*! Provided for cases when automatic conversion from
+ * 'int' to 'int_adapter' causes incorrect results. */
+ int_adapter operator%(const int rhs) const
+ {
+ if(is_special() && rhs != 0)
+ {
+ return mult_div_specials(rhs);
+ }
+ return int_adapter<int_type>(value_ % rhs);
+ }
+private:
+ int_type value_;
+
+ //! returns -1, 0, 1, or 2 if 'this' is <, ==, >, or 'nan comparison' rhs
+ int compare(const int_adapter& rhs)const
+ {
+ if(this->is_special() || rhs.is_special())
+ {
+ if(this->is_nan() || rhs.is_nan()) {
+ if(this->is_nan() && rhs.is_nan()) {
+ return 0; // equal
+ }
+ else {
+ return 2; // nan
+ }
+ }
+ if((is_neg_inf(value_) && !is_neg_inf(rhs.value_)) ||
+ (is_pos_inf(rhs.value_) && !is_pos_inf(value_)) )
+ {
+ return -1; // less than
+ }
+ if((is_pos_inf(value_) && !is_pos_inf(rhs.value_)) ||
+ (is_neg_inf(rhs.value_) && !is_neg_inf(value_)) ) {
+ return 1; // greater than
+ }
+ }
+ if(value_ < rhs.value_) return -1;
+ if(value_ > rhs.value_) return 1;
+ // implied-> if(value_ == rhs.value_)
+ return 0;
+ }
+ /* When multiplying and dividing with at least 1 special value
+ * very simmilar rules apply. In those cases where the rules
+ * are different, they are handled in the respective operator
+ * function. */
+ //! Assumes at least 'this' or 'rhs' is a special value
+ int_adapter mult_div_specials(const int_adapter& rhs)const
+ {
+ int min_value;
+ // quiets compiler warnings
+ bool is_signed = std::numeric_limits<int_type>::is_signed;
+ if(is_signed) {
+ min_value = 0;
+ }
+ else {
+ min_value = 1;// there is no zero with unsigned
+ }
+ if(this->is_nan() || rhs.is_nan()) {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if((*this > 0 && rhs > 0) || (*this < min_value && rhs < min_value)) {
+ return int_adapter<int_type>(pos_infinity());
+ }
+ if((*this > 0 && rhs < min_value) || (*this < min_value && rhs > 0)) {
+ return int_adapter<int_type>(neg_infinity());
+ }
+ //implied -> if(this->value_ == 0 || rhs.value_ == 0)
+ return int_adapter<int_type>(not_a_number());
+ }
+ /* Overloaded function necessary because of special
+ * situation where int_adapter is instantiated with
+ * 'unsigned' and func is called with negative int.
+ * It would produce incorrect results since 'unsigned'
+ * wraps around when initialized with a negative value */
+ //! Assumes 'this' is a special value
+ int_adapter mult_div_specials(const int& rhs) const
+ {
+ int min_value;
+ // quiets compiler warnings
+ bool is_signed = std::numeric_limits<int_type>::is_signed;
+ if(is_signed) {
+ min_value = 0;
+ }
+ else {
+ min_value = 1;// there is no zero with unsigned
+ }
+ if(this->is_nan()) {
+ return int_adapter<int_type>(not_a_number());
+ }
+ if((*this > 0 && rhs > 0) || (*this < min_value && rhs < 0)) {
+ return int_adapter<int_type>(pos_infinity());
+ }
+ if((*this > 0 && rhs < 0) || (*this < min_value && rhs > 0)) {
+ return int_adapter<int_type>(neg_infinity());
+ }
+ //implied -> if(this->value_ == 0 || rhs.value_ == 0)
+ return int_adapter<int_type>(not_a_number());
+ }
+
+};
+
+#ifndef BOOST_DATE_TIME_NO_LOCALE
+ /*! Expected output is either a numeric representation
+ * or a special values representation.<BR>
+ * Ex. "12", "+infinity", "not-a-number", etc. */
+ //template<class charT = char, class traits = std::traits<charT>, typename int_type>
+ template<class charT, class traits, typename int_type>
+ inline
+ std::basic_ostream<charT, traits>&
+ operator<<(std::basic_ostream<charT, traits>& os, const int_adapter<int_type>& ia)
+ {
+ if(ia.is_special()) {
+ // switch copied from date_names_put.hpp
+ switch(ia.as_special())
+ {
+ case not_a_date_time:
+ os << "not-a-number";
+ break;
+ case pos_infin:
+ os << "+infinity";
+ break;
+ case neg_infin:
+ os << "-infinity";
+ break;
+ default:
+ os << "";
+ }
+ }
+ else {
+ os << ia.as_number();
+ }
+ return os;
+ }
+#endif
+
+
+} } //namespace date_time
+
+
+
+#endif