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Questions - constants

Is it impossible to sort custom class with const member by move symantic?

I saw this answer. https://stackoverflow.com/a/47317853/8106257 But, I don't satisfying logical const. Is there any other way to sort custom class object with const member variable? I was firstly thou...
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신승빈

c++

sorting

constants

move

Votes: 0

Answers: 2

Latest Answer

You can't sort your std::vector because the std::sort uses move assignment and move construction to sort the elements. If you take a look here: sort you will find: Type requirements: The type of der...
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Klaus

Using a variable for a property name

When I try this code, I cannot give a const to "option_code" in an object. const option_code = "option1211"; const product_code = "3344"; const size_code = "44"...
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user16633521

javascript

node.js

variables

constants

Votes: 0

Answers: 1

Latest Answer

You're close, you just need to add square brackets around the key name: var product_data = { [option_code]: size_code, quantity: "1", product_id: product_code, } Otherwise, you ...
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Nathan Wiles

How to store constants that can be read from all program, and also be used in defining functions?

I need to form a file named "constants.txt", and then use them when defining runge Funtion. Since the constants in the main function cannot be used outside the main function. How can I do ab...
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user123908

c++

class

constants

Votes: 0

Answers: 1

Latest Answer

I think the simplest way is to define a header file named like constants.h, which contains like #ifndef CONSTANTS_H #define CONSTANTS_H static const float a = 1; static const float b = 2; static cons...
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Teddy van Jerry

How to call a constant inside a class dynamically in PHP?

Here is the code inside App\Entity\User.php: namespace App\Entity; use ... /** * @ORM\Entity(repositoryClass=UserRepository::class) */ class User implements UserInterface, PasswordAuthenticatedUse...
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Edouard

php

symfony

constants

entity

Votes: 0

Answers: 1

Latest Answer

The solution is to use the constant() function. public function getRole(string $roleConstant): ?string { return constant('self::' . $roleConstant); } As precised in this post: Accessing a cla...
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Edouard

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