full adder chain

fulladder_chain.sv

`include "fulladder.sv"                                                                                                                            
                                                                                                                                                   
module fulladder_chain #(parameter WIDTH)(input carry_in, [WIDTH-1:0] a, [WIDTH-1:0] b, output carry_out, [WIDTH-1:0] sum);                        
    const int sizes[] = {WIDTH-2, 0};                                                                                                              
    const int CARRY_WIDTH = sizes.max;                                                                                                             
                                                                                                                                                   
    wire [CARRY_WIDTH:0] carries;                                                                                                                  
    fulladder fa_head(carry_in, a[0], b[0], carries[0], sum[0]);                                                                                   
    fulladder fa_tail(carries[WIDTH-2], a[WIDTH-1], b[WIDTH-1], carry_out, sum[WIDTH-1]);                                                          
    genvar i;                                                                                                                                      
                                                                                                                                                   
    generate                                                                                                                                       
        for (i = 1; i < WIDTH - 1; i++)                                                                                                            
            fulladder fa(carries[i-1], a[i], b[i], carries[i], sum[i]);                                                                            
    endgenerate                                                                                                                                    
endmodule