update example

Author: Zack Siri

.gitignore

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+target
+Cargo.lock

Cargo.toml

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+[package]
+name = "rusty_calculator"
+version = "0.1.0"
+authors = ["Zack Siri <[email protected]>"]
+
+[dependencies]
+ruru = ">= 0.7.0"
+
+[lib]
+crate-type = ["dylib"]

calculator.rb

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+require 'benchmark'
+require 'fiddle'
+
+
+library = Fiddle::dlopen('target/release/librusty_calculator.dylib')
+
+Fiddle::Function.new(library['initialize_my_app'], [], Fiddle::TYPE_VOIDP).call
+
+
+class Calculator
+  def pow_3(number)
+    (1..number).each_with_object({}) do |index, hash|
+      hash[index] = index ** 3
+    end
+  end
+end
+
+# ... somewhere in the application code ...
+Benchmark.bm do |x|
+  x.report {
+    5_000_000.times do 
+      Calculator.new.pow_3(5)
+    end
+  }
+
+  x.report { 
+    5_000_000.times do 
+      RustyCalculator.new.pow_3(5)
+    end
+  }
+end

src/lib.rs

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+#![no_std]
+
+#[macro_use]
+extern crate ruru;
+
+use ruru::VM;
+use ruru::Hash;
+use ruru::Fixnum;
+use ruru::Class;
+use ruru::AnyObject;
+use ruru::types::{Argc, Value};
+use ruru::traits::Object;
+
+class!(RustyCalculator);
+
+methods!(
+    RustyCalculator,
+    itself,
+
+    fn pow_3(num: Fixnum) -> Hash {
+        let mut hash = Hash::new();
+
+        for i in 1..num.to_i64() + 1 {
+            hash.store(Fixnum::new(i), Fixnum::new(i.pow(3)));
+        }
+
+        hash
+    }
+);
+
+#[no_mangle]
+pub extern fn initialize_my_app() {
+    Class::new("RustyCalculator").define(|itself| {
+        itself.def("pow_3", pow_3);
+    });
+}