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auto& in c++

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alistair0111 answered on May 11, 2021 Popularity 10/10 Helpfulness 2/10

answer auto& in c++

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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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Contributed on Dec 12 2021

alistair0111

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auto in c++

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int foo = 0;
auto bar = foo;  // the same as: int bar = foo; 
// type of bar is the type of the value used to initialize it

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Source: cplusplus.com

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Contributed on May 11 2021

Lazy Lyrebird

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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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