/// <summary>
/// Returns a new <see cref="CallSettings"/> with the specified expiration,
/// merged with the (optional) original settings specified by <paramref name="settings"/>.
/// </summary>
/// <param name="settings">Original settings. May be null, in which case the returned settings
/// will only contain the expiration.</param>
/// <param name="expiration">Expiration to use in the returned settings, possibly as part of a retry. May be null,
/// in which case any expiration in <paramref name="settings"/> is not present in the new call settings. If
/// both this and <paramref name="settings"/> are null, the return value is null.</param>
/// <returns>A new set of call settings with the specified expiration, or null of both parameters are null.</returns>
public static CallSettings WithExpiration(
this CallSettings settings,
Expiration expiration) =>
settings == null
? CallSettings.FromExpiration(expiration)
: new CallSettings(settings.CancellationToken,
expiration, settings.Retry, settings.HeaderMutation,
settings.WriteOptions, settings.PropagationToken,
settings.ResponseMetadataHandler, settings.TrailingMetadataHandler);
/// <summary>
/// Returns a new <see cref="CallSettings"/> with the specified expiration,
/// merged with the (optional) original settings specified by <paramref name="settings"/>.
/// </summary>
/// <param name="settings">Original settings. May be null, in which case the returned settings
/// will only contain the expiration.</param>
/// <param name="expiration">Expiration to use in the returned settings, possibly as part of a retry. May be null,
/// in which case any expiration in <paramref name="settings"/> is not present in the new call settings. If
/// both this and <paramref name="settings"/> are null, the return value is null.</param>
/// <returns>A new set of call settings with the specified expiration, or null of both parameters are null.</returns>
public static CallSettings WithExpiration(
this CallSettings settings,
Expiration expiration) =>
settings == null
? CallSettings.FromExpiration(expiration)
#pragma warning disable CS0618 // Type or member is obsolete
// But as long as user code can specify credentials we should continue to respect that.
: new CallSettings(settings.CancellationToken, settings.Credentials,
expiration, settings.Retry, settings.HeaderMutation,
settings.WriteOptions, settings.PropagationToken,
settings.ResponseMetadataHandler, settings.TrailingMetadataHandler);
