/// <summary>
/// Defines a default-constructible <see cref="IMacro"/> in the given <see cref="IPreProcessor"/>.
/// </summary>
/// <typeparam name="TMacro">The type of the <see cref="IMacro"/> to define.</typeparam>
/// <param name="preProcessor">The <see cref="IPreProcessor"/> to define the macro in.</param>
/// <returns>The <see cref="IPreProcessor"/> to be able to chain calls.</returns>
public static IPreProcessor Define <TMacro>(this IPreProcessor preProcessor)
where TMacro : IMacro, new() => preProcessor.Define(_ => new TMacro());
/// <summary> /// Defines the __COUNTER__ macro extension. /// </summary> /// <param name="preProcessor">The <see cref="IPreProcessor"/> to define the macro in.</param> /// <returns>The <see cref="IPreProcessor"/> to be able to chain calls.</returns> public static IPreProcessor DefineCounter(this IPreProcessor preProcessor) => preProcessor.Define <CounterMacro>();
/// <summary>
/// Defines a new <see cref="IMacro"/> with a factory function in the given <see cref="IPreProcessor"/>.
/// </summary>
/// <param name="preProcessor">The <see cref="IPreProcessor"/> to define the macro in.</param>
/// <param name="makeMacro">The factory function that constructs the <see cref="IMacro"/>.</param>
/// <returns>The <see cref="IPreProcessor"/> to be able to chain calls.</returns>
public static IPreProcessor Define(this IPreProcessor preProcessor, Func <IPreProcessor, IMacro> makeMacro)
{
preProcessor.Define(makeMacro(preProcessor));
return(preProcessor);
}