Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Single.cs / 1 / Single.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: Single ** ** ** Purpose: A wrapper class for the primitive type float. ** ** ===========================================================*/ namespace System { using System.Globalization; using System; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; [Serializable(), System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)] [System.Runtime.InteropServices.ComVisible(true)] public struct Single : IComparable, IFormattable, IConvertible #if GENERICS_WORK , IComparable, IEquatable #endif { internal float m_value; // // Public constants // public const float MinValue = (float)-3.40282346638528859e+38; public const float Epsilon = (float)1.4e-45; public const float MaxValue = (float)3.40282346638528859e+38; public const float PositiveInfinity = (float)1.0 / (float)0.0; public const float NegativeInfinity = (float)-1.0 / (float)0.0; public const float NaN = (float)0.0 / (float)0.0; public unsafe static bool IsInfinity(float f) { return (*(int*)(&f) & 0x7FFFFFFF) == 0x7F800000; } public unsafe static bool IsPositiveInfinity(float f) { return *(int*)(&f) == 0x7F800000; } public unsafe static bool IsNegativeInfinity(float f) { return *(int*)(&f) == unchecked((int)0xFF800000); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] public static bool IsNaN(float f) { //Jit will generate inlineable code with this // warning CS1718: Comparison to same variable #pragma warning disable 1718 if (f != f) { return true; } else { return false; } #pragma warning restore 1718 } // Compares this object to another object, returning an integer that // indicates the relationship. // Returns a value less than zero if this object // null is considered to be less than any instance. // If object is not of type Single, this method throws an ArgumentException. // public int CompareTo(Object value) { if (value == null) { return 1; } if (value is Single) { float f = (float)value; if (m_value < f) return -1; if (m_value > f) return 1; if (m_value == f) return 0; // At least one of the values is NaN. if (IsNaN(m_value)) return (IsNaN(f) ? 0 : -1); else // f is NaN. return 1; } throw new ArgumentException (Environment.GetResourceString("Arg_MustBeSingle")); } public int CompareTo(Single value) { if (m_value < value) return -1; if (m_value > value) return 1; if (m_value == value) return 0; // At least one of the values is NaN. if (IsNaN(m_value)) return (IsNaN(value) ? 0 : -1); else // f is NaN. return 1; } public override bool Equals(Object obj) { if (!(obj is Single)) { return false; } float temp = ((Single)obj).m_value; if (temp == m_value) { return true; } return IsNaN(temp) && IsNaN(m_value); } public bool Equals(Single obj) { if (obj == m_value) { return true; } return IsNaN(obj) && IsNaN(m_value); } public unsafe override int GetHashCode() { float f = m_value; if (f == 0) { // Ensure that 0 and -0 have the same hash code return 0; } int v = *(int*)(&f); return v; } public override String ToString() { return Number.FormatSingle(m_value, null, NumberFormatInfo.CurrentInfo); } public String ToString(IFormatProvider provider) { return Number.FormatSingle(m_value, null, NumberFormatInfo.GetInstance(provider)); } public String ToString(String format) { return Number.FormatSingle(m_value, format, NumberFormatInfo.CurrentInfo); } public String ToString(String format, IFormatProvider provider) { return Number.FormatSingle(m_value, format, NumberFormatInfo.GetInstance(provider)); } // Parses a float from a String in the given style. If // a NumberFormatInfo isn't specified, the current culture's // NumberFormatInfo is assumed. // // This method will not throw an OverflowException, but will return // PositiveInfinity or NegativeInfinity for a number that is too // large or too small. // public static float Parse(String s) { return Parse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo); } public static float Parse(String s, NumberStyles style) { NumberFormatInfo.ValidateParseStyleFloatingPoint(style); return Parse(s, style, NumberFormatInfo.CurrentInfo); } public static float Parse(String s, IFormatProvider provider) { return Parse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.GetInstance(provider)); } public static float Parse(String s, NumberStyles style, IFormatProvider provider) { NumberFormatInfo.ValidateParseStyleFloatingPoint(style); return Parse(s, style, NumberFormatInfo.GetInstance(provider)); } private static float Parse(String s, NumberStyles style, NumberFormatInfo info) { try { return Number.ParseSingle(s, style, info); } catch (FormatException) { //If we caught a FormatException, it may be from one of our special strings. //Check the three with which we're concerned and rethrow if it's not one of //those strings. String sTrim = s.Trim(); if (sTrim.Equals(info.PositiveInfinitySymbol)) { return PositiveInfinity; } if (sTrim.Equals(info.NegativeInfinitySymbol)) { return NegativeInfinity; } if (sTrim.Equals(info.NaNSymbol)) { return NaN; } //Rethrow the previous exception; throw; } } public static Boolean TryParse(String s, out Single result) { return TryParse(s, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo, out result); } public static Boolean TryParse(String s, NumberStyles style, IFormatProvider provider, out Single result) { NumberFormatInfo.ValidateParseStyleFloatingPoint(style); return TryParse(s, style, NumberFormatInfo.GetInstance(provider), out result); } private static Boolean TryParse(String s, NumberStyles style, NumberFormatInfo info, out Single result) { if (s == null) { result = 0; return false; } bool success = Number.TryParseSingle(s, style, info, out result); if (!success) { String sTrim = s.Trim(); if (sTrim.Equals(info.PositiveInfinitySymbol)) { result = PositiveInfinity; } else if (sTrim.Equals(info.NegativeInfinitySymbol)) { result = NegativeInfinity; } else if (sTrim.Equals(info.NaNSymbol)) { result = NaN; } else return false; // We really failed } return true; } // // IValue implementation // public TypeCode GetTypeCode() { return TypeCode.Single; } /// bool IConvertible.ToBoolean(IFormatProvider provider) { return Convert.ToBoolean(m_value); } /// char IConvertible.ToChar(IFormatProvider provider) { throw new InvalidCastException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("InvalidCast_FromTo"), "Single", "Char")); } /// sbyte IConvertible.ToSByte(IFormatProvider provider) { return Convert.ToSByte(m_value); } /// byte IConvertible.ToByte(IFormatProvider provider) { return Convert.ToByte(m_value); } /// short IConvertible.ToInt16(IFormatProvider provider) { return Convert.ToInt16(m_value); } /// ushort IConvertible.ToUInt16(IFormatProvider provider) { return Convert.ToUInt16(m_value); } /// int IConvertible.ToInt32(IFormatProvider provider) { return Convert.ToInt32(m_value); } /// uint IConvertible.ToUInt32(IFormatProvider provider) { return Convert.ToUInt32(m_value); } /// long IConvertible.ToInt64(IFormatProvider provider) { return Convert.ToInt64(m_value); } /// ulong IConvertible.ToUInt64(IFormatProvider provider) { return Convert.ToUInt64(m_value); } /// float IConvertible.ToSingle(IFormatProvider provider) { return m_value; } /// double IConvertible.ToDouble(IFormatProvider provider) { return Convert.ToDouble(m_value); } /// Decimal IConvertible.ToDecimal(IFormatProvider provider) { return Convert.ToDecimal(m_value); } /// DateTime IConvertible.ToDateTime(IFormatProvider provider) { throw new InvalidCastException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("InvalidCast_FromTo"), "Single", "DateTime")); } /// Object IConvertible.ToType(Type type, IFormatProvider provider) { return Convert.DefaultToType((IConvertible)this, type, provider); } } }
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