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I am learning C++14 lambdas with const and today my friend showed me this. I could not understand 1. Is it a lambda function but the syntax does not matches what I see usually and the 2. syntax matches with lambda function but it fails with a long error.

int main()
{
    
    // 1.
    const auto x = [&]{
        auto l = 0;
        l = 99;
        return l;
    }();
    
    std::cout << x << endl;
    
    // 2.    
    const auto y = [&](){
    auto l = 0;
    l = 99;
    return l;
    };
    
    std::cout << y << endl;   
    
    return 0;
}

I wanted to know what is 1. and why 2. fails to compile.

I am learning C++14 lambdas with const, and today my friend showed me the following. I could not understand it.

1. Is it a lambda function? The syntax does not matches what I see usually.

2. it syntax matches with a lambda function, but it fails with a long error.

int main()
{
    // 1.
    const auto x = [&]{
        auto l = 0;
        l = 99;
        return l;
    }();
    
    std::cout << x << endl;
    
    // 2.    
    const auto y = [&](){
        auto l = 0;
        l = 99;
        return l;
    };
    
    std::cout << y << endl;   
    
    return 0;
}

I want to know what 1 is, and why 2 fails to compile.

I am learning C++14 lambdas with const and today my friend showed me this. I could not understand 1. Is it a lambda function but the syntax does not matches what I see usually and the 2. syntax matches with lambda function but it fails with a long error.

int main()
{
    
    // 1.
    const auto x = [&]{
        auto const_val = 0;
        const_val = 99;
        return const_val;
    }();
    
    std::cout << x << endl;
    
    // 2.    
    const auto y = [&](){
    auto const_val = 0;
    const_val = 99;
    return const_val;
    };
    
    std::cout << y << endl;   
    
    return 0;
}

I wanted to know what is 1. and why 2. fails to compile.

I am learning C++14 lambdas with const and today my friend showed me this. I could not understand 1. Is it a lambda function but the syntax does not matches what I see usually and the 2. syntax matches with lambda function but it fails with a long error.

int main()
{
    
    // 1.
    const auto x = [&]{
        auto l = 0;
        l = 99;
        return l;
    }();
    
    std::cout << x << endl;
    
    // 2.    
    const auto y = [&](){
    auto l = 0;
    l = 99;
    return l;
    };
    
    std::cout << y << endl;   
    
    return 0;
}

I wanted to know what is 1. and why 2. fails to compile.