475 lines
16 KiB
C#
475 lines
16 KiB
C#
// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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/*============================================================
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**
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** Class: Single
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**
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**
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** Purpose: A wrapper class for the primitive type float.
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**
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**
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===========================================================*/
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namespace System {
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using System.Globalization;
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using System;
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///#if GENERICS_WORK
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/// using System.Numerics;
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///#endif
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using System.Runtime.ConstrainedExecution;
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using System.Diagnostics.Contracts;
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[Serializable]
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[System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)]
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[System.Runtime.InteropServices.ComVisible(true)]
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#if GENERICS_WORK
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public struct Single : IComparable, IFormattable, IConvertible
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, IComparable<Single>, IEquatable<Single>
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/// , IArithmetic<Single>
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#else
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public struct Single : IComparable, IFormattable, IConvertible
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#endif
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{
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internal float m_value;
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//
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// Public constants
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//
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public const float MinValue = (float)-3.40282346638528859e+38;
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public const float Epsilon = (float)1.4e-45;
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public const float MaxValue = (float)3.40282346638528859e+38;
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public const float PositiveInfinity = (float)1.0 / (float)0.0;
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public const float NegativeInfinity = (float)-1.0 / (float)0.0;
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public const float NaN = (float)0.0 / (float)0.0;
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[Pure]
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[System.Security.SecuritySafeCritical] // auto-generated
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[System.Runtime.Versioning.NonVersionable]
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public unsafe static bool IsInfinity(float f) {
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return (*(int*)(&f) & 0x7FFFFFFF) == 0x7F800000;
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}
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[Pure]
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[System.Security.SecuritySafeCritical] // auto-generated
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[System.Runtime.Versioning.NonVersionable]
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public unsafe static bool IsPositiveInfinity(float f) {
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return *(int*)(&f) == 0x7F800000;
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}
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[Pure]
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[System.Security.SecuritySafeCritical] // auto-generated
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[System.Runtime.Versioning.NonVersionable]
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public unsafe static bool IsNegativeInfinity(float f) {
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return *(int*)(&f) == unchecked((int)0xFF800000);
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}
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[Pure]
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
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[System.Security.SecuritySafeCritical]
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[System.Runtime.Versioning.NonVersionable]
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public unsafe static bool IsNaN(float f) {
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return (*(int*)(&f) & 0x7FFFFFFF) > 0x7F800000;
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}
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// Compares this object to another object, returning an integer that
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// indicates the relationship.
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// Returns a value less than zero if this object
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// null is considered to be less than any instance.
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// If object is not of type Single, this method throws an ArgumentException.
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//
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public int CompareTo(Object value) {
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if (value == null) {
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return 1;
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}
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if (value is Single) {
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float f = (float)value;
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if (m_value < f) return -1;
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if (m_value > f) return 1;
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if (m_value == f) return 0;
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// At least one of the values is NaN.
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if (IsNaN(m_value))
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return (IsNaN(f) ? 0 : -1);
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else // f is NaN.
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return 1;
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}
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throw new ArgumentException (Environment.GetResourceString("Arg_MustBeSingle"));
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}
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public int CompareTo(Single value) {
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if (m_value < value) return -1;
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if (m_value > value) return 1;
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if (m_value == value) return 0;
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// At least one of the values is NaN.
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if (IsNaN(m_value))
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return (IsNaN(value) ? 0 : -1);
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else // f is NaN.
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return 1;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator ==(Single left, Single right) {
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return left == right;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator !=(Single left, Single right) {
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return left != right;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator <(Single left, Single right) {
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return left < right;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator >(Single left, Single right) {
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return left > right;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator <=(Single left, Single right) {
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return left <= right;
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}
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[System.Runtime.Versioning.NonVersionable]
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public static bool operator >=(Single left, Single right) {
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return left >= right;
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}
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public override bool Equals(Object obj) {
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if (!(obj is Single)) {
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return false;
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}
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float temp = ((Single)obj).m_value;
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if (temp == m_value) {
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return true;
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}
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return IsNaN(temp) && IsNaN(m_value);
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}
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public bool Equals(Single obj)
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{
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if (obj == m_value) {
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return true;
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}
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return IsNaN(obj) && IsNaN(m_value);
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}
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[System.Security.SecuritySafeCritical] // auto-generated
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public unsafe override int GetHashCode() {
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float f = m_value;
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if (f == 0) {
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// Ensure that 0 and -0 have the same hash code
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return 0;
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}
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int v = *(int*)(&f);
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return v;
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}
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[System.Security.SecuritySafeCritical] // auto-generated
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public override String ToString() {
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Contract.Ensures(Contract.Result<String>() != null);
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return Number.FormatSingle(m_value, null, NumberFormatInfo.CurrentInfo);
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}
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[System.Security.SecuritySafeCritical] // auto-generated
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public String ToString(IFormatProvider provider) {
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Contract.Ensures(Contract.Result<String>() != null);
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return Number.FormatSingle(m_value, null, NumberFormatInfo.GetInstance(provider));
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}
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[System.Security.SecuritySafeCritical] // auto-generated
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public String ToString(String format) {
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Contract.Ensures(Contract.Result<String>() != null);
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return Number.FormatSingle(m_value, format, NumberFormatInfo.CurrentInfo);
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}
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[System.Security.SecuritySafeCritical] // auto-generated
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public String ToString(String format, IFormatProvider provider) {
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Contract.Ensures(Contract.Result<String>() != null);
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return Number.FormatSingle(m_value, format, NumberFormatInfo.GetInstance(provider));
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}
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// Parses a float from a String in the given style. If
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// a NumberFormatInfo isn't specified, the current culture's
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// NumberFormatInfo is assumed.
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//
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// This method will not throw an OverflowException, but will return
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// PositiveInfinity or NegativeInfinity for a number that is too
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// large or too small.
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//
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public static float Parse(String s) {
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return Parse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo);
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}
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public static float Parse(String s, NumberStyles style) {
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NumberFormatInfo.ValidateParseStyleFloatingPoint(style);
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return Parse(s, style, NumberFormatInfo.CurrentInfo);
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}
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public static float Parse(String s, IFormatProvider provider) {
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return Parse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.GetInstance(provider));
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}
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public static float Parse(String s, NumberStyles style, IFormatProvider provider) {
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NumberFormatInfo.ValidateParseStyleFloatingPoint(style);
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return Parse(s, style, NumberFormatInfo.GetInstance(provider));
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}
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private static float Parse(String s, NumberStyles style, NumberFormatInfo info) {
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return Number.ParseSingle(s, style, info);
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}
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public static Boolean TryParse(String s, out Single result) {
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return TryParse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo, out result);
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}
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public static Boolean TryParse(String s, NumberStyles style, IFormatProvider provider, out Single result) {
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NumberFormatInfo.ValidateParseStyleFloatingPoint(style);
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return TryParse(s, style, NumberFormatInfo.GetInstance(provider), out result);
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}
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private static Boolean TryParse(String s, NumberStyles style, NumberFormatInfo info, out Single result) {
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if (s == null) {
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result = 0;
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return false;
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}
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bool success = Number.TryParseSingle(s, style, info, out result);
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if (!success) {
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String sTrim = s.Trim();
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if (sTrim.Equals(info.PositiveInfinitySymbol)) {
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result = PositiveInfinity;
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} else if (sTrim.Equals(info.NegativeInfinitySymbol)) {
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result = NegativeInfinity;
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} else if (sTrim.Equals(info.NaNSymbol)) {
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result = NaN;
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} else
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return false; // We really failed
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}
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return true;
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}
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//
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// IConvertible implementation
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//
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public TypeCode GetTypeCode() {
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return TypeCode.Single;
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}
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/// <internalonly/>
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bool IConvertible.ToBoolean(IFormatProvider provider) {
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return Convert.ToBoolean(m_value);
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}
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/// <internalonly/>
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char IConvertible.ToChar(IFormatProvider provider) {
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throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "Single", "Char"));
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}
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/// <internalonly/>
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sbyte IConvertible.ToSByte(IFormatProvider provider) {
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return Convert.ToSByte(m_value);
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}
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/// <internalonly/>
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byte IConvertible.ToByte(IFormatProvider provider) {
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return Convert.ToByte(m_value);
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}
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/// <internalonly/>
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short IConvertible.ToInt16(IFormatProvider provider) {
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return Convert.ToInt16(m_value);
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}
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/// <internalonly/>
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ushort IConvertible.ToUInt16(IFormatProvider provider) {
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return Convert.ToUInt16(m_value);
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}
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/// <internalonly/>
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int IConvertible.ToInt32(IFormatProvider provider) {
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return Convert.ToInt32(m_value);
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}
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/// <internalonly/>
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uint IConvertible.ToUInt32(IFormatProvider provider) {
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return Convert.ToUInt32(m_value);
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}
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/// <internalonly/>
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long IConvertible.ToInt64(IFormatProvider provider) {
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return Convert.ToInt64(m_value);
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}
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/// <internalonly/>
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ulong IConvertible.ToUInt64(IFormatProvider provider) {
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return Convert.ToUInt64(m_value);
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}
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/// <internalonly/>
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float IConvertible.ToSingle(IFormatProvider provider) {
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return m_value;
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}
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/// <internalonly/>
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double IConvertible.ToDouble(IFormatProvider provider) {
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return Convert.ToDouble(m_value);
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}
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/// <internalonly/>
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Decimal IConvertible.ToDecimal(IFormatProvider provider) {
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return Convert.ToDecimal(m_value);
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}
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/// <internalonly/>
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DateTime IConvertible.ToDateTime(IFormatProvider provider) {
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throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "Single", "DateTime"));
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}
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/// <internalonly/>
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Object IConvertible.ToType(Type type, IFormatProvider provider) {
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return Convert.DefaultToType((IConvertible)this, type, provider);
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}
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///#if GENERICS_WORK
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/// //
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/// // IArithmetic<Single> implementation
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/// //
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.AbsoluteValue(out bool overflowed) {
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/// Single abs = (m_value < 0 ? -m_value : m_value);
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/// overflowed = IsInfinity(abs) || IsNaN(abs);
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/// return abs;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Negate(out bool overflowed) {
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/// Single neg= -m_value;
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/// overflowed = IsInfinity(neg) || IsNaN(neg);
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/// return neg;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Sign(out bool overflowed) {
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/// overflowed = IsNaN(m_value);
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/// if (overflowed) {
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/// return m_value;
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/// }
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/// return (m_value >= 0 ? (m_value == 0 ? 0 : 1) : -1);
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Add(Single addend, out bool overflowed) {
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/// Single s = m_value + addend;
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/// overflowed = IsInfinity(s) || IsNaN(s);
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/// return s;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Subtract(Single subtrahend, out bool overflowed) {
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/// Single s = m_value - subtrahend;
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/// overflowed = IsInfinity(s) || IsNaN(s);
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/// return s;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Multiply(Single multiplier, out bool overflowed) {
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/// Single s = m_value * multiplier;
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/// overflowed = IsInfinity(s) || IsNaN(s);
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/// return s;
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/// }
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///
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Divide(Single divisor, out bool overflowed) {
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/// Single s = m_value / divisor;
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/// overflowed = IsInfinity(s) || IsNaN(s);
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/// return s;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.DivideRemainder(Single divisor, out Single remainder, out bool overflowed) {
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/// remainder = m_value % divisor;
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/// Single s = m_value / divisor;
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/// overflowed = IsInfinity(s) || IsInfinity(remainder) || IsNaN(s) || IsNaN(remainder);
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/// return s;
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/// }
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///
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/// /// <internalonly/>
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/// Single IArithmetic<Single>.Remainder(Single divisor, out bool overflowed) {
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/// Single s = m_value % divisor;
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/// overflowed = IsInfinity(s) || IsNaN(s);
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/// return s;
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/// }
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///
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/// /// <internalonly/>
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/// ArithmeticDescriptor<Single> IArithmetic<Single>.GetDescriptor() {
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/// if (s_descriptor == null) {
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/// s_descriptor = new SingleArithmeticDescriptor( ArithmeticCapabilities.One
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/// | ArithmeticCapabilities.Zero
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/// | ArithmeticCapabilities.MaxValue
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/// | ArithmeticCapabilities.MinValue
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/// | ArithmeticCapabilities.PositiveInfinity
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/// | ArithmeticCapabilities.NegativeInfinity);
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/// }
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/// return s_descriptor;
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/// }
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///
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/// private static SingleArithmeticDescriptor s_descriptor;
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///
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/// class SingleArithmeticDescriptor : ArithmeticDescriptor<Single> {
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/// public SingleArithmeticDescriptor(ArithmeticCapabilities capabilities) : base(capabilities) {}
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/// public override Single One {
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/// get {
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/// return (Single) 1;
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/// }
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/// }
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///
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/// public override Single Zero {
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/// get {
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/// return (Single) 0;
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/// }
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/// }
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///
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/// public override Single MinValue {
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/// get {
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/// return Single.MinValue;
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/// }
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/// }
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///
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/// public override Single MaxValue {
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/// get {
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/// return Single.MaxValue;
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/// }
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/// }
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///
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/// public override Single PositiveInfinity {
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/// get {
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/// return Single.PositiveInfinity;
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/// }
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/// }
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///
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/// public override Single NegativeInfinity {
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/// get {
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/// return Single.NegativeInfinity;
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/// }
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/// }
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///
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/// }
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///#endif // #if GENERICS_WORK
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}
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}
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