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Move deprecations along: std.range.hasLength

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Sebastian Wilzbach 2017-12-13 07:25:44 +01:00
parent b5cdcc99e1
commit b97afe2016
1 changed files with 1 additions and 29 deletions
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30
std/range/primitives.d
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@ -1388,41 +1388,13 @@ This is because a narrow string's length does not reflect the number of
characters, but instead the number of encoding units, and as such is not useful characters, but instead the number of encoding units, and as such is not useful
with range-oriented algorithms. To use strings as random-access ranges with with range-oriented algorithms. To use strings as random-access ranges with
length, use $(REF representation, std, string) or $(REF byCodeUnit, std, utf). length, use $(REF representation, std, string) or $(REF byCodeUnit, std, utf).
Deprecation: Historically `hasLength!R` yielded `true` for types whereby
`R.length` returns other types convertible to `ulong`, such as `int`, `ushort`,
`const(size_t)`, user-defined types using `alias this`, or notably `ulong` on
32-bit systems. This behavior has been deprecated. After December 2017,
`hasLength` will yield `true` only if `R.length` yields the exact type `size_t`.
*/ */
template hasLength(R) template hasLength(R)
{ {
static if (is(typeof(((R* r) => r.length)(null)) Length)) static if (is(typeof(((R* r) => r.length)(null)) Length))
{ enum bool hasLength = is(Length == size_t) && !isNarrowString!R;
static if (is(Length == size_t))
{
enum bool hasLength = !isNarrowString!R;
}
else static if (is(Length : ulong))
{
// @@@DEPRECATED_2017-12@@@
// Uncomment the deprecated(...) message and take the pragma(msg)
// out once https://issues.dlang.org/show_bug.cgi?id=10181 is fixed.
pragma(msg, __FILE__ ~ "(" ~ __LINE__.stringof ~
"): Note: length must have type size_t on all systems" ~
", please update your code by December 2017.");
//deprecated("length must have type size_t on all systems")
enum bool hasLength = true;
}
else
{
enum bool hasLength = false;
}
}
else else
{
enum bool hasLength = false; enum bool hasLength = false;
}
} }
/// ///