Any trick to defining an enum as flags/powers of 2 without eventually needing a calculator?
c#, enums
Solution
Write the values as shifted bits and let the compiler do the math:
[Flags]
private enum Targets : uint
{
None = 0,
Campaigns = 1,
CampaignGroups = 2 << 0,
Advertisers = 2 << 1,
AdvertiserGroups = 2 << 2,
AffiliateGroups = 2 << 3,
Affiliates = 2 << 4,
Creatives = 2 << 5,
DetailedLeads = 2 << 6,
DetailedSales = 2 << 7,
ProgramLeads = 2 << 8,
CreativeDeployments = 2 << 9,
CampaignCategories = 2 << 10,
Payouts = 2 << 11,
// etc.
}
James's suggestion is a good one, too. In fact I like this way even better. You could also write it like this:
[Flags]
private enum Targets : uint
{
None = 0,
Campaigns = 1 << 0,
CampaignGroups = 1 << 1,
Advertisers = 1 << 2,
AdvertiserGroups = 1 << 3,
AffiliateGroups = 1 << 4,
// etc.
}
Problem
I know I can multiply but being the lazy programming I am I do not want to. Has anyone devised some sorcery to auto number the enums as powers of two? Here's the example I have just to make it concrete: ``` [Flags] private enum Targets : uint { None = 0, Campaigns = 1, CampaignGroups = 2, Advertisers = 4, AdvertiserGroups = 8, AffiliateGroups = 16, Affiliates = 32, Creatives = 64, DetailedLeads = 128, DetailedSales = 256, ProgramLeads = 512, CreativeDeployments = 1024, CampaignCategories = 2048, Payouts = 4096, All = uint.MaxValue } ```