Double.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Double.cs / 1 / Double.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  Double 
**
** 
** Purpose: A representation of an IEEE double precision
**          floating point number.
**
** 
===========================================================*/
namespace System { 
 
    using System;
    using System.Globalization; 
    using System.Runtime.InteropServices;
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution;
 
    [Serializable, StructLayout(LayoutKind.Sequential)]
[System.Runtime.InteropServices.ComVisible(true)] 
    public struct Double : IComparable, IFormattable, IConvertible 
#if GENERICS_WORK
        , IComparable, IEquatable 
#endif
    {
        internal double m_value;
 
        //
        // Public Constants 
        // 
        public const double MinValue = -1.7976931348623157E+308;
        public const double MaxValue = 1.7976931348623157E+308; 

        // Note Epsilon should be a double whose hex representation is 0x1
        // on little endian machines.
        public const double Epsilon  = 4.9406564584124654E-324; 
        public const double NegativeInfinity = (double)-1.0 / (double)(0.0);
        public const double PositiveInfinity = (double)1.0 / (double)(0.0); 
        public const double NaN = (double)0.0 / (double)0.0; 

        internal static double NegativeZero = BitConverter.Int64BitsToDouble(unchecked((long)0x8000000000000000)); 

        public unsafe static bool IsInfinity(double d) {
            return (*(long*)(&d) & 0x7FFFFFFFFFFFFFFF) == 0x7FF0000000000000;
        } 
        public static bool IsPositiveInfinity(double d) {
            //Jit will generate inlineable code with this 
            if (d == double.PositiveInfinity) 
            {
                return true; 
            }
            else
            {
                return false; 
            }
        } 
        public static bool IsNegativeInfinity(double d) { 
            //Jit will generate inlineable code with this
            if (d == double.NegativeInfinity) 
            {
                return true;
            }
            else 
            {
                return false; 
            } 
        }
 
        internal unsafe static bool IsNegative(double d) {
            return (*(UInt64*)(&d) & 0x8000000000000000) == 0x8000000000000000;
        }
 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static bool IsNaN(double d) 
        { 
            //Jit will generate inlineable code with this
// warning CS1718: comparison to same variable 
#pragma warning disable 1718
            if (d != d)
            {
                return true; 
            }
            else 
            { 
                return false;
            } 
#pragma warning restore 1718
        }

 
        // Compares this object to another object, returning an instance of System.Relation.
        // Null is considered less than any instance. 
        // 
        // If object is not of type Double, this method throws an ArgumentException.
        // 
        // Returns a value less than zero if this  object
        //
        public int CompareTo(Object value) {
            if (value == null) { 
                return 1;
            } 
            if (value is Double) { 
                double d = (double)value;
                if (m_value < d) return -1; 
                if (m_value > d) return 1;
                if (m_value == d) return 0;

                // At least one of the values is NaN. 
                if (IsNaN(m_value))
                    return (IsNaN(d) ? 0 : -1); 
                else 
                    return 1;
            } 
            throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDouble"));
        }

        public int CompareTo(Double 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
                return 1; 
        }
 
        // True if obj is another Double with the same value as the current instance.  This is 
        // a method of object equality, that only returns true if obj is also a double.
        public override bool Equals(Object obj) { 
            if (!(obj is Double)) {
                return false;
            }
            double temp = ((Double)obj).m_value; 
            // This code below is written this way for performance reasons i.e the != and == check is intentional.
            if (temp == m_value) { 
                return true; 
            }
            return IsNaN(temp) && IsNaN(m_value); 
        }

        public bool Equals(Double obj)
        { 
            if (obj == m_value) {
                return true; 
            } 
            return IsNaN(obj) && IsNaN(m_value);
        } 

        //The hashcode for a double is the absolute value of the integer representation
        //of that double.
        // 
        public unsafe override int GetHashCode() {
            double d = m_value; 
            if (d == 0) { 
                // Ensure that 0 and -0 have the same hash code
                return 0; 
            }
            long value = *(long*)(&d);
            return unchecked((int)value) ^ ((int)(value >> 32));
        } 

        public override String ToString() { 
            return Number.FormatDouble(m_value, null, NumberFormatInfo.CurrentInfo); 
        }
 
        public String ToString(String format) {
            return Number.FormatDouble(m_value, format, NumberFormatInfo.CurrentInfo);
        }
 
        public String ToString(IFormatProvider provider) {
            return Number.FormatDouble(m_value, null, NumberFormatInfo.GetInstance(provider)); 
        } 

        public String ToString(String format, IFormatProvider provider) { 
            return Number.FormatDouble(m_value, format, NumberFormatInfo.GetInstance(provider));
        }

        public static double Parse(String s) { 
            return Parse(s, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo);
        } 
 
        public static double Parse(String s, NumberStyles style) {
            NumberFormatInfo.ValidateParseStyleFloatingPoint(style); 
            return Parse(s, style, NumberFormatInfo.CurrentInfo);
        }

        public static double Parse(String s, IFormatProvider provider) { 
            return Parse(s, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.GetInstance(provider));
        } 
 
        public static double Parse(String s, NumberStyles style, IFormatProvider provider) {
            NumberFormatInfo.ValidateParseStyleFloatingPoint(style); 
            return Parse(s, style, NumberFormatInfo.GetInstance(provider));
        }

        // Parses a double 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.
        //
        private static double Parse(String s, NumberStyles style, NumberFormatInfo info) {
            try { 
                return Number.ParseDouble(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 bool TryParse(String s, out double result) { 
            return TryParse(s, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.CurrentInfo, out result);
        } 

        public static bool TryParse(String s, NumberStyles style, IFormatProvider provider, out double result) {
            NumberFormatInfo.ValidateParseStyleFloatingPoint(style);
            return TryParse(s, style, NumberFormatInfo.GetInstance(provider), out result); 
        }
 
        private static bool TryParse(String s, NumberStyles style, NumberFormatInfo info, out double result) { 
            if (s == null) {
                result = 0; 
                return false;
            }
            bool success = Number.TryParseDouble(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.Double;
        } 
 
        /// 
        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"), "Double", "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 Convert.ToSingle(m_value); 
        } 

        ///  
        double IConvertible.ToDouble(IFormatProvider provider) {
            return 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"), "Double", "DateTime"));
        } 

        ///  
        Object IConvertible.ToType(Type type, IFormatProvider provider) { 
            return Convert.DefaultToType((IConvertible)this, type, provider);
        } 
    }
}
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