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docs: clarify mem.Allocator.reallocFn

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Andrew Kelley 2018-07-13 21:43:11 -04:00
parent 5f1aa3505d
commit 317ed57cb1
1 changed files with 4 additions and 1 deletions
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std/mem.zig
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@ -23,7 +23,10 @@ pub const Allocator = struct {
/// * this function must return successfully.
/// * alignment <= alignment of old_mem.ptr
///
/// The returned newly allocated memory is undefined.
/// When `reallocFn` returns,
/// `return_value[0..min(old_mem.len, new_byte_count)]` must be the same
/// as `old_mem` was when `reallocFn` is called. The bytes of
/// `return_value[old_mem.len..]` have undefined values.
/// `alignment` is guaranteed to be >= 1
/// `alignment` is guaranteed to be a power of 2
reallocFn: fn (self: *Allocator, old_mem: []u8, new_byte_count: usize, alignment: u29) Error![]u8,