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POHow to initialize an array in C++ objects
 

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  1. POHow to initialize an array in C++ objects
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    <p>After reading <a href="https://stackoverflow.com/questions/201101/how-to-initialize-an-array-in-c">How to initialize an array in C</a>, in particular:</p> <blockquote> <p>Don't overlook the obvious solution, though:</p> <p>int myArray[10] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 };</p> </blockquote> <p>I tried something like this:</p> <pre><code>#include &lt;iostream&gt; class Something { private: int myArray[10]; public: Something() { myArray[10] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 }; } int ShowThingy(int what) { return myArray[what]; } ~Something() {} }; int main () { Something Thing; std::cerr &lt;&lt; Thing.ShowThingy(3); } </code></pre> <p>And I get:</p> <pre><code>..\src\Something.cpp: In constructor 'Something::Something()': ..\src\Something.cpp:10:48: error: cannot convert '&lt;brace-enclosed initializer list&gt;' to 'int' in assignment </code></pre> <p>The obvious in this case is not so obvious. I really would like the initiation of my array to be more dynamic as well.</p> <p>I tired:</p> <pre><code>private: int * myArray; public: Something() { myArray = new int [10]; myArray = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 }; } </code></pre> <p>This looked funky to me to, and so to the compiler:</p> <pre><code>..\src\Something.cpp: In constructor 'Something::Something()': ..\src\Something.cpp:11:44: error: cannot convert '&lt;brace-enclosed initializer list&gt;' to 'int*' in assignment </code></pre> <p>This also did not work:</p> <pre><code>private: int myArray[10] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 }; </code></pre> <p>with:</p> <pre><code> ..\src\Something.cpp:6:20: error: a brace-enclosed initializer is not allowed here before '{' token ..\src\Something.cpp:6:51: sorry, unimplemented: non-static data member initializers ..\src\Something.cpp:6:51: error: 'constexpr' needed for in-class initialization of static data member 'myArray' of non-integral type </code></pre> <p>I have been doing really good and learning what does not work, but not so good learning what does work.</p> <p>So, how do I used initialization lists {value, value, value} for an array inside a class?</p> <p>I have been trying to figure out how to do this for some time now and am very stuck, I have a number of these kinds of lists I need to make for my app.</p>
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    1. COOne of the stupid things about raw arrays in C++ is that they're not directly assignable. (I.e., the following isn't allowed. `int a[10], b[10]; a = b;`)
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    2. COSince C++11 is being mentioned in this post, I'll point out std::array: `std::array<int, 10> a = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 }; std::array<int, 10> b = a; std::array<int, 10> c; c.fill(5);`
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