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    <p>Actually, a program containing a narrowing conversion in a brace list initializer is <strong>ill-formed</strong>. I am not sure why the compiler just gives you a warning, but it definitely should issue an error here (FWIW, <a href="http://coliru.stacked-crooked.com/view?id=f4b28ee252709be69fa3e506e6646409-25dabfc2c190f5ef027f31d968947336">Clang does that</a>).</p> <p>Also notice, that this is a narrowing (and therefore illegal) conversion as well:</p> <pre><code>int x { 1.0f }; // ERROR! Narrowing conversion required </code></pre> <p>Per paragraph 8.5.4/3 of the C++11 Standard:</p> <blockquote> <p>List-initialization of an object or reference of type T is defined as follows:</p> <p>— If <code>T</code> is an aggregate, aggregate initialization is performed (8.5.1). [...]</p> <p>— Otherwise, if the initializer list has no elements [...]</p> <p>— Otherwise, if <code>T</code> is a specialization of <code>std::initializer_list&lt;E&gt;</code>, [...]</p> <p>— Otherwise, if <code>T</code> is a class type, constructors are considered. The applicable constructors are enumerated and the best one is chosen through overload resolution (13.3, 13.3.1.7). <strong>If a narrowing conversion (see below) is required to convert any of the arguments, the program is ill-formed</strong>. [...]</p> </blockquote> <p>To be more precise, the Standard only says that a "diagnostic" is required in this case, and a warning is a diagnostic, so the compiler's behavior is conforming - but I believe emitting an error would be a better behavior.</p>
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    1. CO+1, I was convinced this should be an error.
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    2. CONarrowing conversions now apply to C-arrays ([example](http://coliru.stacked-crooked.com/view?id=c45787e3e4535b20bcc37c6d62a9e074-e54ee7a04e4b807da0930236d4cc94dc)). Therefore, making narrowing conversions an error could break existing code.
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    3. CO@Morwenn: That's true, but in this case we are not initializing an aggregate
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