/// <summary>
/// Verifies whether the <see cref="MathProgram" /> contains a constant value, i.e., whether any one of its
/// descendant programs are instances have a constant value equal to <paramref name="val" />.
/// </summary>
/// <returns>
/// <c>true</c>, if program contains a constant value equal to <paramref name="val" />, <c>false</c> otherwise.
/// </returns>
/// <param name="program">The program to verify whether it contains a constant.</param>
/// <param name="val">The value to test for the program.</param>
public static bool ContainsConstant(this ITreeProgram <double> program, double val)
{
return(program != null &&
(program.EqualsConstant(val) ||
program.Input != null && program.Input.Count > 0 &&
program.Input.Any(child => child.ContainsConstant(val))));
}
