lib_xch 0.13.0

Crate xch-ceb's official lib
Documentation 
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// Copyright 2017-2019 LEXUGE
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

use crate::public::failures::ErrorCases;
use num::traits::ops::checked::{
    CheckedAdd, CheckedDiv, CheckedMul, CheckedNeg, CheckedRem, CheckedSub,
};
// inside use(s)
use super::{failures::ErrorCases::Overflow, traits::CheckedCalc};

// Operator
pub enum Operator {
    Add,
    Sub,
    Mul,
    Div,
    Neg,
    Rem,
}

pub fn safe_calc<T: CheckedCalc>(a: &T, b: &T, op: &Operator) -> Result<T, ErrorCases> {
    match *op {
        Operator::Add => CheckedAdd::checked_add(a, b).ok_or(Overflow),
        Operator::Sub => CheckedSub::checked_sub(a, b).ok_or(Overflow),
        Operator::Mul => CheckedMul::checked_mul(a, b).ok_or(Overflow),
        Operator::Div => CheckedDiv::checked_div(a, b).ok_or(Overflow),
        Operator::Rem => CheckedRem::checked_rem(a, b).ok_or(Overflow),
        Operator::Neg => CheckedNeg::checked_neg(a).ok_or(Overflow),
    }
}