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Add "offsetof" to Struct classes #83

Merged
merged 2 commits into from
Jul 1, 2021
Merged

Add "offsetof" to Struct classes #83

merged 2 commits into from
Jul 1, 2021

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tenderlove
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I need to get the offset of a member inside a struct without allocating
the struct. This patch adds an "offsetof" class method to structs that
are generated.

The usage is like this:

MyStruct = struct [
  "int64_t i",
  "char c",
]

MyStruct.offsetof("i") # => 0
MyStruct.offsetof("c") # => 8

@tenderlove
Add "offsetof" to Struct classes
07576db 
I need to get the offset of a member inside a struct without allocating
the struct.  This patch adds an "offsetof" class method to structs that
are generated.

The usage is like this:

```ruby
MyStruct = struct [
  "int64_t i",
  "char c",
]

MyStruct.offsetof("i") # => 0
MyStruct.offsetof("c") # => 8
```
kou
kou approved these changes Jul 1, 2021
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test/fiddle/test_c_struct_builder.rb Outdated Show resolved Hide resolved
@tenderlove @kou
Update test/fiddle/test_c_struct_builder.rb
a6d3333 
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
@tenderlove tenderlove merged commit 4e3b60c into master Jul 1, 2021
@tenderlove tenderlove deleted the offsetof branch July 1, 2021 00:35
matzbot pushed a commit to ruby/ruby that referenced this pull request Jul 13, 2021
@tenderlove @kou @nobu
[ruby/fiddle] Add "offsetof" to Struct classes (ruby/fiddle#83)
5c0d8c6 
* Add "offsetof" to Struct classes

I need to get the offset of a member inside a struct without allocating
the struct.  This patch adds an "offsetof" class method to structs that
are generated.

The usage is like this:

```ruby
MyStruct = struct [
  "int64_t i",
  "char c",
]

MyStruct.offsetof("i") # => 0
MyStruct.offsetof("c") # => 8
```

* Update test/fiddle/test_c_struct_builder.rb

Co-authored-by: Sutou Kouhei <kou@cozmixng.org>

ruby/fiddle@4e3b60c5b6

Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
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@tenderlove @kou