A function call requires that the current execution frame is suspended, and a new frame is created and pushed on the stack. This is relatively expensive, compared to many other operations. You can measure the exact time required with the timeit module: >>> import timeit >>> def f(): pass … >>> timeit.timeit(f) 0.15175890922546387 That’s 1/6th … Read more
Real pass-by-reference is impossible in Java. Java passes everything by value, including references. But you can simulate it with container Objects. Use any of these as a method parameter: an array a Collection an AtomicXYZ class And if you change its contents in a method, the changed contents will be available to the calling context. … Read more
On modern operating systems, each process has its own address space and addresses are only valid within a process. If you want to execute code in some other process, you either have to inject a shared library or attach your program as a debugger. Once you are in the other program’s address space, this code … Read more
One of the standard conversions, in both C and C++, is the function-to-pointer conversion; when a function name appears in an expression, it can be converted into a pointer to that function. So: foo is equivalent to &foo *foo is equivalent to *(&foo), or foo **foo is eqivalent to **(&foo), or *foo, or foo and … Read more
You can, with some caveats. You either have to use the member function in a way that code will be generated or have it be not inline, and your mangled definition should be extern “C” to prevent “double mangling”. E.g.: #include <cstdio> struct Foo { const char* message; void goo(); }; void Foo::goo() { std::printf(“%s”, … Read more
memmove will never return anything other than dest. Returning dest, as opposed to making memmove void, is useful when the first argument is a computed expression, because it lets you avoid computing the same value upfront, and storing it in a variable. This lets you do in a single line void *dest = memmove(&buf[offset] + … Read more
Aside from the fact that there’s no call (and therefore no associated expenses, like parameter preparation before the call and cleanup after the call), there’s another significant advantage of inlining. When the function body is inlined, it’s body can be re-interpreted in the specific context of the caller. This might immediately allow the compiler to … Read more
Replace the staticmethod with a classmethod. This will be passed the class when it is called, so you can get the class name from that. class Bar(object): @classmethod def bar(cls): # code print cls.__name__ class Foo(Bar): # code pass >>> Bar.bar() Bar >>> Foo.bar() Foo
Use ScriptEngine.eval(java.io.Reader) to read the script ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName(“JavaScript”); // read script file engine.eval(Files.newBufferedReader(Paths.get(“C:/Scripts/Jsfunctions.js”), StandardCharsets.UTF_8)); Invocable inv = (Invocable) engine; // call function from script file inv.invokeFunction(“yourFunction”, “param”);
Consider the following expressions: a = (“Hello SO!”) a = “Hello SO!” They’re equivalent. In the same way, with a statement: statement_keyword(“foo”) statement_keyword “foo” are also equivalent. Notice that if you change your print function to: print(“Hello”,”SO!”) You’ll notice a difference between python 2 and python 3. With python 2, the (…,…) is interpteted as … Read more