Deployment

var sortloopsABI = [{"constant":true,"inputs":[{"name":"x","type":"uint256"}],"name":"sort","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"}];
var sortloopsBC = '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';

var sortloopsContract = web3.cmt.contract(sortloopsABI);
var sortloops = sortloopsContract.new(
   {
     from: web3.cmt.accounts[0],
     data: sortloopsBC,
     gas: '4700000'
   }, function (e, contract){
    console.log(e, contract);
    if (typeof contract.address !== 'undefined') {
         console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
    }
 })

eni_sort.cpp

#include <eni.h>
#include <string>

class Sort : public eni::EniBase
{
public:
  Sort(const std::string& pArgStr) : eni::EniBase(pArgStr) { }

  ~Sort() { }

private:
  bool parse(const json::Array& pArgs) override {
        x = pArgs[0].toInteger();
        return true;
  }

  eni::Gas gas() const override {
    return 10000;
  }

  bool run(json::Array& pRetVal) override {
    eni::Int arr[10] = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
    eni::Int sum = 0;
    for(eni::Int k=0;k<x;k++){
        bool swapped=false;
        for(int i=0; i<sizeof(arr)-1; i++){
            for(int j=0; j<sizeof(arr)-1-i; j++){
                if(arr[j]>arr[i]){
                    eni::Int temp=arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                    swapped=true;
                }
            }
            if(!swapped) break;
        }
        swapped=false;
        for(int i=0; i<sizeof(arr)-1; i++){
            for(int j=0; j<sizeof(arr)-1-i; j++){
                if(arr[j]<arr[i]){
                    eni::Int temp=arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                    swapped=true;
                }
            }
            if(!swapped) break;
        }
    }
    sum = sum + sizeof(arr);
    std::string s=boost::lexical_cast<std::string>(sum);
    pRetVal.emplace_back(s);
    return true;
  }

private:
        eni::Int x;

};
ENI_C_INTERFACE(sort, Sort)

Error

> sortloops.sort(9000);
Error: new BigNumber() not a base 16 number:
    at raise (web3-cmt.js:16843:29)
    at web3-cmt.js:16831:33
    at BigNumber (web3-cmt.js:15865:28)
    at web3-cmt.js:9439:23
    at web3-cmt.js:9963:20
    at web3-cmt.js:9155:16
    at map (<native code>)
    at web3-cmt.js:9154:12
    at web3-cmt.js:12391:18

Makefile

CPPFLAGS=-I/home/ubuntu/libeni/include
CXXFLAGS=-std=c++11 -fPIC
LDFLAGS=-L/home/ubuntu/libeni/lib
LDADD=-leni

all:
        g++ ${CPPFLAGS} ${CXXFLAGS} ${LDFLAGS} -shared -oeni_sort.so eni_sort.cpp ${LDADD}

sort.sol

pragma solidity ^0.4.23;

contract sortloops {

    function sort(uint256 x) public pure returns(string) {
        string memory sum;
        sum=eni("sort", x);
        return sum;
    }
}