bytes32 is not implicitly convertible

Question

I am getting some errors related to bytes32. I tried to use the casting but it is not solving the proble. My code is:

pragma solidity ^0.5.6.0;

    contract peInKSub{
      bytes32 [] m_pendingIndex ; 
      struct pendingConfirmation{
         bytes32 index;
         uint yetNeeded;
         bytes32 pendingOp;
      }
    
      pendingConfirmation pending;
    
      function confirmAndCheck ( bytes32 _operation )public returns ( bool ) { 
        pending.pendingOp = m_pendingIndex [ _operation ];
        // if we 're not yet working on this operation ,
        // switch over and reset the confirmation status .
        if ( pending . yetNeeded == 0) { 
          pending . index =  m_pendingIndex[_operation] . length ++;
          //m_pendingIndex [ pending . index ] = _operation ;
        }//if
      }//fun
    }//contract

My error messages are:

solc prg46.sol prg46.sol:14:38: Error: Type bytes32 is not implicitly convertible to expected type uint256. pending.pendingOp = m_pendingIndex [ _operation ]; ^--------^ prg46.sol:18:35: Error: Type bytes32 is not implicitly convertible to expected type uint256. pending . index = m_pendingIndex[_operation] . length ++; ^--------^ prg46.sol:18:20: Error: Expression has to be an lvalue. pending . index = m_pendingIndex[_operation] . length ++; ^---------------------------------^ prg46.sol:18:20: Error: Type uint8 is not implicitly convertible to expected type bytes32. pending . index = m_pendingIndex[_operation] . length ++; ^------------------------------------^

Somebody please guide me.

Zulfi.

Answer 1

m_pendingIndex[_operation] . length ++

That variable is bytes32 as defined here:

bytes32 [] m_pendingIndex ; 

As such, it is 32 bytes long and the length cannot the adjusted. You seem to be trying to increase it but that is not possible.

Hope it helps.