/// <summary>
/// Initializes a new instance of the AstFunctionNode class given the function name and the math command.
/// </summary>
/// <param name="function">The PostFixMathCommand object used to process this
/// function's parameters and supply the result.</param>
/// <param name="children">The children.</param>
internal AstFunctionNode( PostfixMathCommand function, IEnumerable< AstNode > children )
{
_pfmc = function;
_name = function.Symbol;
foreach ( AstNode child in children )
AddChild( child );
}
/// <summary>
/// Initializes a new instance of the AstFunctionNode class given the function name and the math command.
/// </summary>
/// <param name="function">The PostFixMathCommand object used to process this
/// function's parameters and supply the result.</param>
/// <param name="functionName">The name of the function, or operator symbol.</param>
internal AstFunctionNode( PostfixMathCommand function, string functionName )
{
_pfmc = function;
_name = functionName;
}