# SafeMath .add() imposes infinite gas

When I use `add()` function from Solidity SafeMath library, I get infinite gas requirement in remix (and this reflects in transactions that wont go through).

Simplified example:

``````function someFunction() internal view returns (bool) {
uint256 a = 23;
uint256 b = 48;
}
``````

SafeMath is included.

What is wrong?

Here is paste of SafeMath included:

https://pastebin.com/C4FVyBFa

Version used:

pragma solidity ^0.4.24;

• SafeMath isn't that big. Can we see the whole contract so we can replicate this? – Rob Hitchens Nov 14 '18 at 4:07
• This function literally doesn't depend on anything else. – tonino.j Nov 14 '18 at 4:09
• Other functions don't have same issue, and classic addition fixes it. – tonino.j Nov 14 '18 at 4:10
• edited question – tonino.j Nov 14 '18 at 4:18

I meant we really need to see the whole contract that is causing the issue so we might spot something.

Here's a slightly modified version of your function (so it's callable from outside) which is working as expected in a super basic shell of a contract.

``````// File: zeppelin-solidity/contracts/math/SafeMath.sol

/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {

/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (_a == 0) {
return 0;
}

c = _a * _b;
assert(c / _a == _b);
return c;
}

/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
// assert(_b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = _a / _b;
// assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
return _a / _b;
}

/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
assert(_b <= _a);
return _a - _b;
}

/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
c = _a + _b;
assert(c >= _a);
return c;
}
}

contract Try {

using SafeMath for uint256;

function someFunction() public view returns (bool) {
uint256 a = 23;
uint256 b = 48; 