zig/doc/langref/cli_allocation.zig

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const std = @import("std");
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
const ptr = try allocator.create(i32);
std.debug.print("ptr={*}\n", .{ptr});
}
// exe=succeed