/// <summary>Defines a relationship which updates a value only if the source value meets certain criteria.</summary>
/// <typeparam name="T">The type of value.</typeparam>
/// <param name="source">The source to track.</param>
/// <param name="predicate">A method which determines whether the resulting <see cref="ResponsiveValue{T}"/> should be updated.</param>
/// <returns>A <see cref="ResponsiveValue{T}"/> which will always have a value equal to the last value the <see cref="source"/> had that met the criteria defined in the <see cref="predicate"/>. If no value has met that critera yet, the value will be the type's default value.</returns>
public static ResponsiveValue <T> Where <T>(this ResponsiveValue <T> source, Func <T, bool> predicate)
{
return(new WhereResponsiveOperator <T>(source, predicate));
}
/// <summary>Defines a relationship which maps the source value to a new value.</summary>
/// <typeparam name="TSource">The type of values being mapped from.</typeparam>
/// <typeparam name="TResult">The type of values being mapped to.</typeparam>
/// <param name="source">The source to track.</param>
/// <param name="selector">The method which maps source values to the values of the resulting <see cref="ResponsiveValue{T}"/>.</param>
/// <returns>A <see cref="ResponsiveValue{T}"/> which will always have a value equal to the <see cref="selector"/> being applied on the <see cref="source"/>'s value.</returns>
public static ResponsiveValue <TResult> Select <TSource, TResult>(this ResponsiveValue <TSource> source, Func <TSource, TResult> selector)
{
return(new SelectResponsiveOperator <TSource, TResult>(source, selector));
}
