logo
down
shadow

Why would you use the keyword const if you already know variable should be constant?


Why would you use the keyword const if you already know variable should be constant?

Content Index :

Why would you use the keyword const if you already know variable should be constant?
Tag : cpp , By : PaulPlum
Date : November 24 2020, 05:47 AM


Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Why const is ignored in auto keyword on constant reference


Tag : cpp , By : Munir
Date : March 29 2020, 07:55 AM
I hope this helps . Because the type deduction rules for auto deduce to an object type. You are copy initializing a new int from the one referenced by b.
That's by design. We want to create new objects without explicitly specifying their type. And more often than not, it's a new object that is a copy some other object. Had it deduced to a reference, it would defeat the intended purpose.
decltype(auto) d = b; // d and b now refer to the same object
d = 15; // And this will error because the cv-qualifiers are the same as b's

How to set a variable to constant defined using "const" keyword?


Tag : php , By : Phil Austin
Date : March 29 2020, 07:55 AM
seems to work fine I need to store an array to a constant. I am using PHP 5.6, so cant use define. I am getting that data from database. , You can save array like this
define('VAR_DATA', implode(',',array(1, 2, 3)));
$array = explode(',',VAR_DATA);

Defining constant in c with const keyword


Tag : c , By : CSCI GOIN KILL ME
Date : March 29 2020, 07:55 AM
I wish this helpful for you Using the const type qualifier doesn't make something a constant. A constant in C has its own definition.
See § 6.7.3 ¶ 6 of the C11 standard for a description of the const keyword:
float user_array[] = {5.1, 7.2, 5.1, 8.45, 23.0, 67.123, 5.1};

Why declare a constant pointer using the const keyword when the reference (const pointer) is available?


Tag : cpp , By : user177837
Date : March 29 2020, 07:55 AM

const keyword and constant expressions in C99 and C11


Tag : c , By : D B
Date : March 29 2020, 07:55 AM
Related Posts Related QUESTIONS :
  • Binary tree coding problems with c++?
  • How to safely change the type of a pointer
  • Can I get a pointer to a pointer pointing to nullptr, is it valid
  • Most elegant way to split a C++ TypeList
  • How to access element of JSON using Qt
  • find the inorder traversal of the tree and print them all by negating every alternate number
  • How to compile a static library with Codelite 11.0.0?
  • Could this publish / check-for-update class for a single writer + reader use memory_order_relaxed or acquire/release for
  • Passing a function identifier as an rvalue reference and applying std::move() to it
  • The conditional operator is not allowing the program to terminate
  • Define a c++ string as "\"
  • memcpy on __declspec naked returns unexpected bytes
  • What is the proper way to link enums with CMake?
  • is it safe to use the same mutex with lock_gard and without it in other parts of code
  • How to decode MAP Invoke messages using asn1c generated code
  • How do you write multiple lines in a .txt with recursion?
  • Member function with strange type causing callback function mismatch
  • Visual Studio optimisations break SDL graphical output
  • How to use less memory in Sieve_of_Eratosthenes
  • Covariance in Callback Parameters C++
  • switch may fall through (no it may not)
  • Compilation fails calling Cocoa function from C++
  • How to handle classes with differently named member functions in algorithms?
  • Convert QString to QJsonArray
  • Data exchange finished in CPropertyPage::OnOK?
  • Template member specialization in template class
  • Is it not possible to assign a struct to an index of a vector?
  • Why is empty unordered_map.find not returning end()?
  • Template argument deduction for inheriting specializations
  • dlopen undefined reference
  • Member function of class with template arguments and default arguments outside class
  • Is it possible to implement a non-owning "slightly smart" pointer on top of standard weak pointers?
  • how to configure the AcquireCredentialsHandleA correctly
  • Using private versions of global extern variables with OpenMP
  • Eigen Block wrong amount of columns and rows
  • Memory alignment rules in inheritance
  • Is nullptr falsy?
  • tm_wday returns a large integer outside 0-6 range
  • Scope a using declaration, inside a header
  • How to specify constructor's template arguments inside a new expression?
  • Sort an array via x86 Assembly (embedded in C++)?? Possible?
  • How to Replace only Part of the Variable using #define
  • How do you compare the performace of valarrays vs built-in arrays?
  • Is it normal for C++ static initialization to appear twice in the same backtrace?
  • c++ generate a good random seed for psudo random number generators
  • Why isn't my operator overloading working properly?
  • Getting meaningful error messages from fstream's in C++
  • C++: Converting Julian dates to Gregorian
  • Could someone explain this interesting behaviour with Sleep(1)?
  • Is it possible to roll a significantly faster version of modf
  • Updating pointer using signals and slots
  • How are classes more secure than structures?
  • finding "distance" between two pixel's colors
  • C++ Greatest Number Verification
  • Why does my token return NULL and how can I fix it?(c++)
  • C++ enforce conditions on inherited classes
  • what happened if an exception is not captured?
  • Redundant naming in C/C++ typedefs/structs
  • question about STL thread-safe and STL debugging
  • killing a separate thread having a socket
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com