using for solidity

The solution for “using for solidity” can be found here. The following code will assist you in solving the problem.

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// `for` is used to attach functions to variable types.


// Example:

function sum(uint a, uint b) returns(uint) {

return a + b;

}


using sum for uint;


// then you can use this inside your contracts:

contract MyContract {

function add1(uint num) public pure returns(uint) {

return num.sum(1);

// `num` is passed as the first parameter (`a`) and `1` as the second (`b`)

}

}


// You can also use libraries this way:


library Math {

function sum(uint a, uint b) returns(uint) {

return a + b;

}


function sub1(uint x) returns(uint) {

return(x – 1);

}

}


contract MyContract {

using Math for uint;


function uselessCalculation(uint x, uint y) returns(uint) {

return x.sum(y).sub1();

}


}
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