typical vector type has

• basic constructor, for example float2() which will initialize all fields to zero
• single value constructor, for example float4(13) which will initialize all fields to that one value
• full blown constructor, for example float3(x,y,z) which will initialize individual fields

all vector constructors are expect to have all arguments to be of the same type

• float2(0x12,0x13) - fine
• float3(1,2,3.0) - error, the last field is not an integer

all vector constructors will accept all numeric types

• range(1.2,2.3) will perform normal type conversion, and will end up being range(1,2)

Q> how are constructors different from the regular functions?
A> they are not