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1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // e32\euser\maths\um_spec.cpp |
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15 // Functions to check for and set special values |
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16 // |
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17 // |
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18 |
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19 |
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20 #include "um_std.h" |
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21 |
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22 |
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23 |
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24 |
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25 #ifndef __REALS_MACHINE_CODED__ |
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26 EXPORT_C TBool Math::IsZero(const TReal &aVal) |
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27 /** |
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28 Determines whether a value is zero. |
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29 |
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30 @param aVal A reference to the value to be checked. |
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31 |
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32 @return True, if aVal is zero; false, otherwise. |
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33 */ |
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34 { |
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35 |
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36 SReal64 *pS=(SReal64 *)&aVal; |
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37 |
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38 if (pS->msm==0 && pS->lsm==0 && pS->exp==KTReal64ZeroExponent) |
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39 return TRUE; |
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40 else |
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41 return FALSE; |
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42 } |
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43 |
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44 |
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45 |
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46 |
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47 EXPORT_C TBool Math::IsNaN(const TReal &aVal) |
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48 /** |
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49 Determines whether a value is not a number. |
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50 |
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51 @param aVal A reference to the value to be checked. |
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52 |
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53 @return True, if aVal is not a number; false, otherwise. |
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54 */ |
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55 { |
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56 |
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57 SReal64 *pS=(SReal64 *)&aVal; |
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58 |
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59 if (pS->exp==KTReal64SpecialExponent && (pS->msm|pS->lsm)!=0) |
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60 return TRUE; |
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61 else |
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62 return FALSE; |
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63 } |
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64 |
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65 |
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66 |
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67 |
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68 EXPORT_C TBool Math::IsInfinite(const TReal &aVal) |
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69 /** |
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70 Determines whether a value is infinite. |
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71 |
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72 @param aVal A reference to the value to be checked. |
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73 |
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74 @return True, if aVal is infinite; false, otherwise. |
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75 */ |
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76 { |
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77 |
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78 SReal64 *pS=(SReal64 *)&aVal; |
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79 |
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80 if (pS->msm==0 && pS->lsm==0 && pS->exp==KTReal64SpecialExponent) |
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81 return TRUE; |
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82 else |
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83 return FALSE; |
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84 } |
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85 |
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86 |
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87 |
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88 |
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89 EXPORT_C TBool Math::IsFinite(const TReal &aVal) |
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90 /** |
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91 Determines whether a value is finite. |
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92 |
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93 In this context, a value is finite if it is a valid number and |
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94 is not infinite. |
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95 |
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96 @param aVal A reference to the value to be checked. |
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97 |
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98 @return True, if aVal is finite; false, otherwise. |
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99 */ |
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100 { |
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101 |
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102 SReal64 *pS=(SReal64 *)&aVal; |
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103 |
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104 if (pS->exp!=KTReal64SpecialExponent) |
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105 return TRUE; |
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106 else |
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107 return FALSE; |
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108 } |
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109 |
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110 |
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111 |
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112 |
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113 EXPORT_C void Math::SetZero(TReal &aVal,TInt aSign) |
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114 // |
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115 // Constructs zeros, assuming default sign is positive |
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116 // |
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117 { |
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118 |
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119 SReal64 *pS=(SReal64 *)&aVal; |
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120 pS->sign=aSign; |
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121 pS->exp=KTReal64ZeroExponent; |
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122 pS->msm=0; |
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123 pS->lsm=0; |
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124 } |
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125 |
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126 |
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127 |
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128 |
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129 EXPORT_C void Math::SetNaN(TReal &aVal) |
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130 // |
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131 // Constructs NaN (+ve sign for Java) |
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132 // |
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133 { |
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134 |
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135 SReal64 *pS=(SReal64 *)&aVal; |
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136 pS->sign=0; |
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137 pS->exp=KTReal64SpecialExponent; |
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138 pS->msm=0xfffffu; |
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139 pS->lsm=0xffffffffu; |
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140 } |
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141 |
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142 |
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143 |
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144 |
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145 EXPORT_C void Math::SetInfinite(TReal &aVal,TInt aSign) |
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146 // |
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147 // Constructs infinities |
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148 // |
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149 { |
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150 |
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151 SReal64 *pS=(SReal64 *)&aVal; |
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152 pS->sign=aSign; |
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153 pS->exp=KTReal64SpecialExponent; |
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154 pS->msm=0; |
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155 pS->lsm=0; |
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156 } |
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157 #endif |
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158 |