Recent questions tagged reference

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reference - Extending borrow lifetimes in rust

I'm trying to parse a series to tokentrees, but when I try to implement my parsing trait I get an error related to ... panic!("not done yet"), } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference variable name in excel vba

I have a load of variable names in a spreadsheet column. These variables are defined and have values in the modules I ... sheet 2: cell A1: 2 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - PHP param by ref => assign to ref = NULL

I found a strange behavior when passing parameter by reference to an object method: class Test { private $value; ... = &$value1 not works here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - What is the exact definition of the for loop in Rust?

I'm coming from a C (and to a lesser extent, C++) background. I wrote the following code snippet: fn main() ... are A and B supposed to be? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - CString::new().unwrap().as_ptr() gives empty *const c_char

I have a C function that expects *const std::os::raw::c_char and I have done the following in Rust: use std: ... string. What did I do wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - How to give object away to python garbage collection?

There are several threads on Python garbage collection in SO, and after reading about five, plus some doc on ... the deletion of the object? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Why does Python handle '1 is 1**2' differently from '1000 is 10**3'?

Inspired by this question about caching small integers and strings I discovered the following behavior which I don ... behavior be explained? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Java Legal Forward Referencing

Is the following code the case of legal forward referencing? if yes why? public class MyClass { private static int x = ... .out.println(x); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - How to create a variable that can be set only once but isn't final in Java

I want a class that I can create instances of with one variable unset (the id), then initialise this variable ... to make this more elegant. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Meaning of the ampersand '&' and star '*' symbols in Rust

Despite thoroughly reading the documentation, I'm rather confused about the meaning of the & and * symbol in Rust, ... references. Why is this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Why does the argument for the find closure need two ampersands?

I have been playing with Rust by porting my Score4 AI engine to it - basing the work on my functional- ... any help/clarification most welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Types for which "is" keyword may be equivalent to equality operator in Python

For some types in Python, the is operator seems to be equivalent to the == operator. For example: >>> 1 ... to understand these sort of issues? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - What is an idiomatic way to collect an iterator of &T into a collection of Ts?

I need to collect an iterator over a slice of &strs into a collection of &strs. The problem is that the ... HashSet<&str>>(); } Playground See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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reference - Mutable borrow in a loop

I have the following code: struct Baz { x: usize, y: usize, } struct Bar { baz: Baz, } impl Bar { ... so removing them is a non-solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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464 views

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reference - C# out parameters vs returns

So I am new to C# and I am having difficulty understanding out. As opposed to just returning something from a ... to favor one or the other? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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reference - Why does the Rust compiler error with "cannot borrow as immutable because it is also borrowed as mutable" after moving the variable into a scope?

After reading about Rust's scopes and references, I wrote a simple code to test them. fn main() { / ... compiler produce this error message? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Why does Perl autovivify in this case?

Why does $a become an arrayref? I'm not pushing anything to it. perl -MData::Dumper -e 'use strict; 1 for @$a; print Dumper $a' $VAR1 = []; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference class - In R, is it possible to suppress "Note: no visible binding for global variable"?

I'm wondering if its possible to suppress these outputs in R which are cluttering up the console: Note: no visible ... and I will never use it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - How to convert Option<&T> to Option<T> in the most idiomatic way in Rust?

When using HashMap's get method, I get an Option<&T>, I've encountered it again this time with Option< ... the utility traits to achieve that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Why does cloning my custom type result in &T instead of T?

use generic_array::*; // 0.12.3 use num::{Float, Zero}; // 0.2.0 #[derive(Clone, Debug)] struct Vector<T, N: ... T { self.dot(self.clone()) } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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446 views

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reference - Rust lifetime error expected concrete lifetime but found bound lifetime

I am having an issue working with lifetime parameters for structs. I am not 100% sure how to describe the problem, ... Thanks for all the help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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reference - How does Python referencing work?

I am confused with Python referencing. Consider the following example: My task : To edit each element in the ... object copies? Please clarify. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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500 views

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reference type size in java

Why does a reference type in java take 8 bytes? Why not less or more than 8 bytes? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - Why is "&&" being used in closure arguments?

I have two questions regarding this example: let a = [1, 2, 3]; assert_eq!(a.iter().find(|&&x| x == 2), ... Some(&2) used rather than Some(2)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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458 views

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reference - How can Java assignment be made to point to an object instead of making a copy?

In a class, I have: private Foo bar; public Constructor(Foo bar) { this.bar = bar; } Instead of creating a ... printing y prints 9 instead of 7? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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409 views

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reference - Passing a class as a ref parameter in C# does not always work as expected. Can anyone explain?

I always thought that a method parameter with a class type is passed as a reference parameter by default. Apparently ... 'm trying to solve... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

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reference - PHP: Self-referencing array

Is there a way of referencing an array key from within the array? This may make more sense in code format: ... search for "php array reference". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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889 views

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reference - How to query mongodb with DBRef

suppose I have the following datastructure: var user = {_id: 'foo', age: 35}; var post = {_id: '... ... and google! Anyone has any idea? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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