adding booleans (as integer) [duplicate]

Question

I wrote a code in AS3 which allowed me to check if a particular number of things were true...

If (true + false + true + true + false + true + true < 4)
{

}

When i tried rewriting in C#, it tells me i cannot add type bool and bool. Is the best way of doing this to rewrite it like this? Or is there some simpler work around?

If ((true?1:0) + (false?1:0) + (true?1:0) + (true?1:0) + (false?1:0) + (true?1:0) + (true?1:0) < 4)
{

}

Answer 1

Try using IEnumerable<T>.Count(Func<T,bool>) from System.Linq, with T as bool, on a params method parameter.

public static int CountTrue(params bool[] args) {    return args.Count(t => t); } 

Usage

// The count will be 3 int count = CountTrue(false, true, false, true, true); 

---

You can also introduce a this extension method:

public static int TrueCount(this bool[] array) {    return array.Count(t => t); } 

Usage

// The count will be 3 int count = new bool[] { false, true, false, true, true }.TrueCount(); 

Answer 2

You could create an array and use Count:

if ((new []{true, false, true, true, false, true, true}).Count(x=>x) < 4)
{

}

or the Sum method:

if ((new []{true, false, true, true, false, true, true}).Sum(x=>x?1:0) < 4)
{

}

Answer 3

Here's a more fun example:

if ((BoolCount)true + false + true + true + false + true + true <= 5)
{
    Console.WriteLine("yay");
}

Using this class:

struct BoolCount
{
    private readonly int c;
    private BoolCount(int c) { this.c = c; }

    public static implicit operator BoolCount(bool b)
        { return new BoolCount(Convert.ToInt32(b)); }

    public static implicit operator int(BoolCount me)
        { return me.c; }

    public static BoolCount operator +(BoolCount me, BoolCount other)
        { return new BoolCount(me.c + other.c); }
}