Macro range 

macro_rules! range {
    (empty) => { ... };
    ('(',; ')') => { ... };
    ('(', $h:expr; ')') => { ... };
    ('(', $h:expr; ']') => { ... };
    ('(' $l:expr,; ')') => { ... };
    ('[' $l:expr,; ')') => { ... };
    ('(' $l:expr, $h:expr; ')') => { ... };
    ('(' $l:expr, $h:expr; ']') => { ... };
    ('[' $l:expr, $h:expr; ')') => { ... };
    ('[' $l:expr, $h:expr; ']') => { ... };
}

The range! macro can make it easier to create ranges. It roughly mirrors traditional mathematic range syntax.

Example

#[macro_use]
extern crate postgres_range;

use postgres_range::Range;

fn main() {
    let mut r: Range<i32>;
    // a closed interval
    r = range!('[' 5i32, 10i32; ']');
    // an open interval
    r = range!('(' 5i32, 10i32; ')');
    // half-open intervals
    r = range!('(' 5i32, 10i32; ']');
    r = range!('[' 5i32, 10i32; ')');
    // a closed lower-bounded interval
    r = range!('[' 5i32,; ')');
    // an open lower-bounded interval
    r = range!('(' 5i32,; ')');
    // a closed upper-bounded interval
    r = range!('(', 10i32; ']');
    // an open upper-bounded interval
    r = range!('(', 10i32; ')');
    // an unbounded interval
    r = range!('(',; ')');
    // an empty interval
    r = range!(empty);
}