Int32, Int64 default constructor now takes an optional int parameter.

pkg/fixnum/lib/src/int32.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of fixnum;
 
 /**
  * An immutable 32-bit signed integer, in the range [-2^31, 2^31 - 1].
  * Arithmetic operations may overflow in order to maintain this range.
  */
@@ skipping 63 matching lines @@
         throw new Exception("Non-radix code unit: $c");
       }
       x = (x * radix) + digit;
     }
     return x;
   }
 
   /**
    * Parses a decimal [String] and returns an [Int32].
    */
-  static Int32 parseInt(String s) => new Int32.fromInt(int.parse(s));
+  static Int32 parseInt(String s) => new Int32(int.parse(s));
 
   /**
    * Parses a hexadecimal [String] and returns an [Int32].
    */
   static Int32 parseHex(String s) => parseRadix(s, 16);
 
   // Assumes i is <= 32-bit.
   static int _bitCount(int i) {
     // See "Hacker's Delight", section 5-1, "Counting 1-Bits".
 
@@ skipping 34 matching lines @@
 
   // The internal value, kept in the range [MIN_VALUE, MAX_VALUE].
   final int _i;
 
   const Int32._internal(int i) : _i = i;
 
   /**
    * Constructs an [Int32] from an [int].  Only the low 32 bits of the input
    * are used.
    */
-  Int32.fromInt(int i) : _i = (i & 0x7fffffff) - (i & 0x80000000);
+  Int32([int i=0]) : _i = (i & 0x7fffffff) - (i & 0x80000000);
+
+  /**
+   * Constructs an [Int32] from an [int].  Only the low 32 bits of the input
+   * are used.
+   */
+  @deprecated
+  Int32.fromInt(int i) : this(i);
 
   // Returns the [int] representation of the specified value. Throws
   // [ArgumentError] for non-integer arguments.
   int _toInt(val) {
     if (val is Int32) {
       return val._i;
     } else if (val is int) {
       return val;
     }
     throw new ArgumentError(val);
@@ skipping 10 matching lines @@
   // left-hand side:
   //
   // Int32 % int => Int32
   // Int32 % Int32 => Int32
   // Int32 % Int64 => Int32
 
   IntX operator +(other) {
     if (other is Int64) {
       return this.toInt64() + other;
     }
-    return new Int32.fromInt(_i + _toInt(other));
+    return new Int32(_i + _toInt(other));
   }
 
   IntX operator -(other) {
     if (other is Int64) {
       return this.toInt64() - other;
     }
-    return new Int32.fromInt(_i - _toInt(other));
+    return new Int32(_i - _toInt(other));
   }
 
-  Int32 operator -() => new Int32.fromInt(-_i);
+  Int32 operator -() => new Int32(-_i);
 
   IntX operator *(other) {
     if (other is Int64) {
       return this.toInt64() * other;
     }
     // TODO(rice) - optimize
     return (this.toInt64() * other).toInt32();
   }
 
   Int32 operator %(other) {
     if (other is Int64) {
       // Result will be Int32
       return (this.toInt64() % other).toInt32();
     }
-    return new Int32.fromInt(_i % _toInt(other));
+    return new Int32(_i % _toInt(other));
   }
 
   Int32 operator ~/(other) {
     if (other is Int64) {
       return (this.toInt64() ~/ other).toInt32();
     }
-    return new Int32.fromInt(_i ~/ _toInt(other));
+    return new Int32(_i ~/ _toInt(other));
   }
 
   Int32 remainder(other) {
     if (other is Int64) {
       Int64 t = this.toInt64();
       return (t - (t ~/ other) * other).toInt32();
     }
     return this - (this ~/ other) * other;
   }
 
   Int32 operator &(other) {
     if (other is Int64) {
       return (this.toInt64() & other).toInt32();
     }
-    return new Int32.fromInt(_i & _toInt(other));
+    return new Int32(_i & _toInt(other));
   }
 
   Int32 operator |(other) {
     if (other is Int64) {
       return (this.toInt64() | other).toInt32();
     }
-    return new Int32.fromInt(_i | _toInt(other));
+    return new Int32(_i | _toInt(other));
   }
 
   Int32 operator ^(other) {
     if (other is Int64) {
       return (this.toInt64() ^ other).toInt32();
     }
-    return new Int32.fromInt(_i ^ _toInt(other));
+    return new Int32(_i ^ _toInt(other));
   }
 
-  Int32 operator ~() => new Int32.fromInt(~_i);
+  Int32 operator ~() => new Int32(~_i);
 
   Int32 operator <<(int n) {
     if (n < 0) {
       throw new ArgumentError(n);
     }
     n &= 31;
-    return new Int32.fromInt(_i << n);
+    return new Int32(_i << n);
   }
 
   Int32 operator >>(int n) {
     if (n < 0) {
       throw new ArgumentError(n);
     }
     n &= 31;
     int value;
     if (_i >= 0) {
       value = _i >> n;
     } else {
       value = (_i >> n) | (0xffffffff << (32 - n));
     }
-    return new Int32.fromInt(value);
+    return new Int32(value);
   }
 
   Int32 shiftRightUnsigned(int n) {
     if (n < 0) {
       throw new ArgumentError(n);
     }
     n &= 31;
     int value;
     if (_i >= 0) {
       value = _i >> n;
     } else {
       value = (_i >> n) & ((1 << (32 - n)) - 1);
     }
-    return new Int32.fromInt(value);
+    return new Int32(value);
   }
 
   /**
    * Returns [true] if this [Int32] has the same numeric value as the
    * given object.  The argument may be an [int] or an [IntX].
    */
   bool operator ==(other) {
     if (other is Int32) {
       return _i == other._i;
     } else if (other is Int64) {
@@ skipping 41 matching lines @@
 
   bool get isEven => (_i & 0x1) == 0;
   bool get isMaxValue => _i == 2147483647;
   bool get isMinValue => _i == -2147483648;
   bool get isNegative => _i < 0;
   bool get isOdd => (_i & 0x1) == 1;
   bool get isZero => _i == 0;
 
   int get hashCode => _i;
 
-  Int32 abs() => _i < 0 ? new Int32.fromInt(-_i) : this;
+  Int32 abs() => _i < 0 ? new Int32(-_i) : this;
 
   int numberOfLeadingZeros() => _numberOfLeadingZeros(_i);
   int numberOfTrailingZeros() => _numberOfTrailingZeros(_i);
 
   List<int> toBytes() {
     List<int> result = new List<int>(4);
     result[0] = _i & 0xff;
     result[1] = (_i >> 8) & 0xff;
     result[2] = (_i >> 16) & 0xff;
     result[3] = (_i >> 24) & 0xff;
     return result;
   }
 
   int toInt() => _i;
   Int32 toInt32() => this;
-  Int64 toInt64() => new Int64.fromInt(_i);
+  Int64 toInt64() => new Int64(_i);
 
   String toString() => _i.toString();
   String toHexString() => _i.toRadixString(16);
   String toRadixString(int radix) => _i.toRadixString(radix);
 }