1 // ***********************************************************************
2 // Copyright (c) 2008 Charlie Poole
4 // Permission is hereby granted, free of charge, to any person obtaining
5 // a copy of this software and associated documentation files (the
6 // "Software"), to deal in the Software without restriction, including
7 // without limitation the rights to use, copy, modify, merge, publish,
8 // distribute, sublicense, and/or sell copies of the Software, and to
9 // permit persons to whom the Software is furnished to do so, subject to
10 // the following conditions:
12 // The above copyright notice and this permission notice shall be
13 // included in all copies or substantial portions of the Software.
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 // ***********************************************************************
25 #define NUNIT_FRAMEWORK
29 namespace NUnit.Framework.Constraints
32 /// ReusableConstraint wraps a constraint expression after
33 /// resolving it so that it can be reused consistently.
35 public class ReusableConstraint : IResolveConstraint
37 private readonly IConstraint constraint;
40 /// Construct a ReusableConstraint from a constraint expression
42 /// <param name="c">The expression to be resolved and reused</param>
43 public ReusableConstraint(IResolveConstraint c)
45 this.constraint = c.Resolve();
49 /// Converts a constraint to a ReusableConstraint
51 /// <param name="c">The constraint to be converted</param>
52 /// <returns>A ReusableConstraint</returns>
53 public static implicit operator ReusableConstraint(Constraint c)
55 return new ReusableConstraint(c);
59 /// Returns a <see cref="System.String"/> that represents this instance.
62 /// A <see cref="System.String"/> that represents this instance.
64 public override string ToString()
66 return constraint.ToString();
69 #region IResolveConstraint Members
72 /// Return the top-level constraint for this expression
74 /// <returns></returns>
75 public IConstraint Resolve()