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C++ auto keyword important-2

VARAK-VURAK answered on September 21, 2022 Popularity 1/10 Helpfulness 1/10

answer C++ auto keyword important-2

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C++ auto keyword important-2

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// cl /EHsc /nologo /W4
#include <deque>
using namespace std;

int main()
{
    deque<double> dqDoubleData(10, 0.1);

    for (auto iter = dqDoubleData.begin(); iter != dqDoubleData.end(); ++iter)
    { /* ... */ }

    // prefer range-for loops with the following information in mind
    // (this applies to any range-for with auto, not just deque)

    for (auto elem : dqDoubleData) // COPIES elements, not much better than the previous examples
    { /* ... */ }

    for (auto& elem : dqDoubleData) // observes and/or modifies elements IN-PLACE
    { /* ... */ }

    for (const auto& elem : dqDoubleData) // observes elements IN-PLACE
    { /* ... */ }
}

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Source: learn.microsoft.com

Tags: auto c++ keyword

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Contributed on Sep 21 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

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C++ auto keyword important

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    // std::initializer_list<int>
    auto A = { 1, 2 };

    // std::initializer_list<int>
    auto B = { 3 };

    // int
    auto C{ 4 };

    // C3535: cannot deduce type for 'auto' from initializer list'
    auto D = { 5, 6.7 };

    // C3518 in a direct-list-initialization context the type for 'auto'
    // can only be deduced from a single initializer expression
    auto E{ 8, 9 };

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Source: Grepper

Tags: auto c++ keyword

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Contributed on Sep 21 2022

VARAK-VURAK

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C++ auto keyword important-2

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