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    <p>That is because array types decay to pointers when used as function parameters or when passed as function argument. In other words, <strong>your function signature is equivalent to</strong>:</p> <pre><code>template &lt;typename T&gt; inline T bigArry(const T* data) </code></pre> <p>The range-based <code>for</code> loop passes <code>data</code> to the global <code>std::begin()</code> and <code>std::end()</code> functions in order to get iterators to (respectively) the first and the one-past-the-last element of the container.</p> <p>Of course, there are no global <code>std::begin()</code> and <code>std::end()</code> functions that accept a <em>pointer</em>, and they couldn't be meaningfully defined either: how to determine the end of the container given just a pointer to its first element?</p> <p>You can use <code>std::array</code> instead of C arrays (<code>std::array</code> is a zero-overhead wrapper around a C array), and modify your calling function accordingly:</p> <pre><code>template &lt;typename T&gt; inline T bigArry(std::array&lt;T, 5&gt; data) // ^^^^^^^^^^^^^^^^ { T level = data[0]; for(T item : data) { if(level&lt;item){ level=item; } } return level; } int main() { std::array&lt;int, 5&gt; data = {1,2,3,4,5}; // ^^^^^^^^^^^^^^^^^^^^^^^ std::cout &lt;&lt; bigArry(data); return 0; } </code></pre> <p>Here is a <a href="http://coliru.stacked-crooked.com/view?id=077762de7ca7140694e66912bfce7e6c-a63ad9fea3739cb794a74965e5d28fb3"><strong>live example</strong></a>.</p>
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    1. COI believe this signature will work with plain C arrays and some other containers, including `std::vector`s and `std::array`s: `template <typename C> inline decltype(C[0]) bigArry(C const & data) {...}`
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    2. CO@Andy: Actually [the rules for the curly-braces](http://stackoverflow.com/questions/11734861/when-can-outer-braces-be-omitted-in-an-initializer-list) are a bit confusing at times. But what I said before doesn't apply in this case.
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    3. CO@Nawaz: OK, thank you for the link
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