/// <summary>
/// Gets a new specification expression which corresponds to the logical
/// combination of the specified objects: <c>AND</c>.
/// </summary>
/// <returns>A specification expression.</returns>
/// <param name="spec">A specification expression.</param>
/// <param name="composeWith">Another specification expression.</param>
/// <typeparam name="T">The generic type of the specifications.</typeparam>
public static ISpecificationExpression <T> And <T>(this ISpecificationExpression <T> spec, ISpecificationExpression <T> composeWith)
{
var func1 = spec.GetExpressionOrThrow();
var func2 = composeWith.GetExpressionOrThrow();
return(Spec.Expr(func1.And(func2)));
}
/// <summary>
/// Gets a new specification expression which corresponds to the logical
/// negation of the specified object: <c>NOT</c>.
/// </summary>
/// <returns>A specification expression.</returns>
/// <param name="spec">A specification expression.</param>
/// <typeparam name="T">The generic type of the specification.</typeparam>
public static ISpecificationExpression <T> Not <T>(this ISpecificationExpression <T> spec)
{
return(Spec.Expr(spec.GetExpressionOrThrow().Not()));
}
/// <summary>
/// Gets a function from a specification expression, as if it were a
/// <see cref="ISpecificationFunction{T}"/>.
/// </summary>
/// <returns>A function, representing the compiled expression contained within the specification expression.</returns>
/// <param name="spec">A specification expression.</param>
/// <typeparam name="T">The generic type of the specification.</typeparam>
public static Func <T, bool> GetFunction <T>(this ISpecificationExpression <T> spec)
{
var expr = spec.GetExpressionOrThrow();
return(expr.Compile());
}
