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When using C libraries, C99 designator list initialization is often
times used to initialize data structure.
While `std.mem.zeroes` and manually assigning to each field can
achieve the same result, it is much more verbose then the equivalent
C code:
```zig
usingnamespace @cImport({
@cInclude("sokol_app.h");
});
// Using `std.mem.zeroes` and manual assignment.
var app_desc = std.mem.zeroes(sapp_desc);
app_desc.init_cb = init;
app_desc.frame_cb = frame;
app_desc.cleanup_cb = cleanup;
app_desc.width = 400;
app_desc.height = 300;
app_desc.window_name = "no default init";
// Using `std.mem.defaultInit`.
var app_desc = std.mem.defaultInit(sapp_desc, .{
.init_cb = init,
.frame_cb = frame,
.cleanup_cb = cleanup,
.width = 400,
.height = 300,
.window_name = "default init"
});
```
The `std.mem.defaultInit` aims to solve this problem by zero
initializing all fields of the given struct to their zero, or default
value if any. Each field mentionned in the `init` variable is then
assigned to the corresponding field in the struct.
If a field is a struct, and an initializer for it is present, it is
recursively initialized.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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Building from Source
Note that you can download a binary of master branch.
Stage 1: Build Zig from C++ Source Code
Dependencies
POSIX
- cmake >= 2.8.5
- gcc >= 5.0.0 or clang >= 3.6.0
- LLVM, Clang, LLD development libraries == 10.x, compiled with the same gcc or clang version above
- Use the system package manager, or build from source.
Windows
- cmake >= 3.15.3
- Microsoft Visual Studio. Supported versions:
- 2015 (version 14)
- 2017 (version 15.8)
- 2019 (version 16)
- LLVM, Clang, LLD development libraries == 10.x
- Use the pre-built binaries or build from source.
Instructions
POSIX
mkdir build
cd build
cmake ..
make install
MacOS
brew install cmake llvm
brew outdated llvm || brew upgrade llvm
mkdir build
cd build
cmake .. -DCMAKE_PREFIX_PATH=$(brew --prefix llvm)
make install
You will now run into this issue: homebrew and llvm 10 packages in apt.llvm.org are broken with undefined reference to getPollyPluginInfo
Please help upstream LLVM and Homebrew solve this issue, there is nothing Zig can do about it. See that issue for a workaround you can do in the meantime.
Windows
See https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows