Syntax
RangeExpression :
RangeExpr
| RangeFromExpr
| RangeToExpr
| RangeFullExpr
| RangeInclusiveExpr
| RangeToInclusiveExprRangeExpr :
Expression..
ExpressionRangeFromExpr :
Expression..
RangeToExpr :
..
ExpressionRangeFullExpr :
..
RangeInclusiveExpr :
Expression..=
ExpressionRangeToInclusiveExpr :
..=
Expression
The ..
and ..=
operators will construct an object of one of the
std::ops::Range
(or core::ops::Range
) variants, according to the following
table:
Production | Syntax | Type | Range |
---|---|---|---|
RangeExpr | start.. end |
std::ops::Range | start ≤ x < end |
RangeFromExpr | start.. |
std::ops::RangeFrom | start ≤ x |
RangeToExpr | .. end |
std::ops::RangeTo | x < end |
RangeFullExpr | .. |
std::ops::RangeFull | - |
RangeInclusiveExpr | start..= end |
std::ops::RangeInclusive | start ≤ x ≤ end |
RangeToInclusiveExpr | ..= end |
std::ops::RangeToInclusive | x ≤ end |
Examples:
1..2; // std::ops::Range
3..; // std::ops::RangeFrom
..4; // std::ops::RangeTo
..; // std::ops::RangeFull
5..=6; // std::ops::RangeInclusive
..=7; // std::ops::RangeToInclusive
The following expressions are equivalent.
let x = std::ops::Range {start: 0, end: 10};
let y = 0..10;
assert_eq!(x, y);
Ranges can be used in for
loops:
for i in 1..11 {
println!("{}", i);
}