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Low-level binding for Cplex

This crate provides automatically generated low-level bindings to Cplex. The build script scans the C-header files and creates appropriate functions and constants.

In order to compile this crate, the environment variable CPLEX_HOME must be set to path containing cplex, e.g.

export CPLEX_HOME=/opt/CPLEX_Studio1271/cplex
cargo build

(That path should contain the header files in include/ilcplex and the library in lib/x86-64_linux).

Note that this is a really low-level. The functions are just plain bindings to the C-API without any additional safe guards.

Example

#[macro_use]
extern crate cplex_sys as cpx;
use std::os::raw::{c_char, c_int};
use std::ffi::CString;
use std::ptr::null;

fn main() {
    let mut status = 0;
    let mut env = unsafe { cpx::openCPLEX(&mut status) };
    assert_eq!(status, 0);

    let mut lp = unsafe {
        cpx::createprob(env, &mut status,
                        CString::new("Test LP").unwrap().as_ptr())
    };
    assert_eq!(status, 0);

    let obj     = [1.0,  2.0, 3.0];
    let ub      = [40.0, cpx::INFBOUND, cpx::INFBOUND];
    let rmatbeg = [0,              3];
    let rmatind = [0,    1,   2,   0,   1,    2];
    let rmatval = [-1.0, 1.0, 1.0, 1.0, -3.0, 1.0];
    let sense   = ['L' as c_char, 'L' as c_char];
    let rhs     = [20.0, 30.0];

    unwrapcpx!(cpx::newcols(env, lp, 3, obj.as_ptr(), null(), ub.as_ptr(),
                            null(), null()));
    unwrapcpx!(cpx::addrows(env, lp,
                            0, 2, rmatval.len() as c_int,
                            rhs.as_ptr(), sense.as_ptr(),
                            rmatbeg.as_ptr(), rmatind.as_ptr(), rmatval.as_ptr(),
                            null(), null()));
    unwrapcpx!(cpx::chgobjsen(env, lp, cpx::MAX));
    unwrapcpx!(cpx::lpopt(env, lp));

    let mut x = [0.0; 3];
    let mut objval = 0.0;
    unwrapcpx!(cpx::getobjval(env, lp, &mut objval));
    unwrapcpx!(cpx::getx(env, lp, x.as_mut_ptr(), 0, 2));
    assert!((objval - 202.5).abs() < 1e-9);
    assert!((x[0] - 40.0).abs() < 1e-9);
    assert!((x[1] - 17.5).abs() < 1e-9);
    assert!((x[2] - 42.5).abs() < 1e-9);

    unwrapcpx!(cpx::freeprob(env, &mut lp));
    unwrapcpx!(cpx::closeCPLEX(&mut env));
}

cplex-sys 0.3.0

Example