iscss function

src/ecc/ECC.jl

@@ -37,7 +37,11 @@ Only CSS codes have this method.
 
 See also: [`parity_checks`](@ref)"""
 function parity_checks_x(code::AbstractECC)
+    if iscss(code)
+    # Existing implementation for CSS codes
+    else
     throw(lazy"Codes of type $(typeof(code)) do not have separate X and Z parity checks, either because they are not a CSS code and thus inherently do not have separate checks, or because its separate checks are not yet implemented in this library.")
+    end
 end
 
 """Parity check boolean matrix of a code (only the Z entries in the tableau, i.e. the checks for X errors).
@@ -46,10 +50,16 @@ Only CSS codes have this method.
 
 See also: [`parity_checks`](@ref)"""
 function parity_checks_z(code::AbstractECC)
+    if iscss(code)
+    # Existing implementation for CSS codes
+    else
     throw(lazy"Codes of type $(typeof(code)) do not have separate X and Z parity checks, either because they are not a CSS code and thus inherently do not have separate checks, or because its separate checks are not yet implemented in this library.")
+    end
 end
 
-function iscss(code::AbstractECC) = false end  # Default: not CSS
+function iscss(code::AbstractECC)
+    return false  # Default: not CSS
+end
 
 parity_checks(s::Stabilizer) = s
 Stabilizer(c::AbstractECC) = parity_checks(c)