c# - Converting a mutable Class to immutable Class/Struct -

c# - Converting a mutable Class to immutable Class/Struct -

situation:

i have class looks like:

public class block<c, m> c : icomparable<c> m : imetadata { public block() { lambda = new list<lambda<c, m>>(); } internal int omega { set; get; } internal list<lambda<c, m>> lambda { set; get; } } public class lambda<c, m> c : icomparable<c> m : imetadata { public lambda(char tau, m ati) { this.tau = tau; this.ati = ati; } internal char tau { private set; get; } internal m ati { private set; get; } }

i utilize block class following:

block<c, m> block = new block<c, m>(); block.lambda.add(new lambda<c, m>(/* parameters */)); block.omega++;

.

question:

i store on b+tree +400,000,000 instances of block; during process lambda list extended regularly (i.e., multiple block.lambda.add() ).

i'm going multi-thread, hence have alter mutable block immutable; in regard:

block potentially larger 16bytes hence based on msdn changing struct not recommended. an immutable object object state cannot modified after created; block.lambda.add() violating property!

eric lippert's blog on immutability has awesome classification of different immutable objects; however, still i'm not sure type explains situation best.

i'm aware can implement custom add returns new re-create of block modified lambda, although i'm not sure whether thought or not!

at point, i'm stuck @ best solution converting mutable class immutable given big item count. sincerely appreciate suggestion.

c# immutability mutable