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C++ auto&&

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VARAK-VURAK answered on December 12, 2021 Popularity 7/10 Helpfulness 1/10

answer C++ auto&&

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C++ auto&&

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auto&& vec = some_expression_that_may_be_rvalue_or_lvalue;
auto i = std::begin(vec);
(*i)++;
//By using auto&& var = <initializer> you are saying: I will accept any initializer regardless of whether it is an lvalue or rvalue expression and I will preserve its constness

Popularity 7/10 Helpfulness 1/10 Language cpp

Source: stackoverflow.com

Tags: c++

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Contributed on Feb 03 2023

VARAK-VURAK

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auto& in c++

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    Use auto && for the ability to modify and discard values of the sequence within the loop. (That is, unless the container provides a read-only view, such as std::initializer_list, in which case it will be effectively an auto const &.)
    Use auto & to modify the values of the sequence in a meaningful way.
    Use auto const & for read-only access.
    Use auto to work with (modifiable) copies.

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Source: Grepper

Tags: c++

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Contributed on Dec 12 2021

alistair0111

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c++ auto

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//When using auto variables, the data type is decided in initialisation

#include <iostream>
using namespace std;

int main() {
    auto IntegerVar=25;   //creates integer type variable
    auto FloatVar=26.77;  //creates float type variable
    auto StringVar="Hello";  //creates string type variable
    auto CharVar="C";   //creates char type variable
  
    cout<<"CREATING VARIABLES USING AUTO DATA TYPE\n\n";
    cout<<"Integer: "<<IntegerVar<<endl;
    cout<<"Float: "<<FloatVar<<endl;
    cout<<"String: "<<StringVar<<endl;
    cout<<"Char: "<<CharVar;
    
    cout<<"\n\n";
    return 0;
}

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Source: Grepper

Tags: auto

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Contributed on May 11 2022

ALeonidou

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C++ auto&&

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