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POstd::is_base_of() depth
 

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    <p>I have a such hierarchy:</p> <pre><code>namespace MyService{ class IBase { public: virtual ~IBase(){} protected: IPointer *_somePointer; }; } </code></pre> <p><br /></p> <pre><code>class IInterface: public MyService::IBase { public: virtual ~IInterface(){} virtual std::string get() const = 0; }; </code></pre> <p><br /> </p> <pre><code>class ConcreteClass: public IInterface { public: std::string get() const { bool isNull = (_somePointer == NULL); return "Hello"; } }; </code></pre> <p><br /></p> <pre><code>bool isBase = std::is_base_of&lt;IBase, ConcreteClass&gt;::value; </code></pre> <p>I need to check is I3 is derived from I1. But std::is_base_of() doesn't work well for me - it return false. The goal is to add to any class IBase and check any class is there IBase in it hierarchy</p> <p>Found the problem, but not solution. My code is:</p> <pre><code>template&lt;class Base, class Derived&gt; bool IsDerivedFromBase() { if( std::tr1::is_fundamental&lt;Base&gt;::value ) throw MyService::Exceptions::ETypeTraitsInvalidArgument( "Base class can't be POD" ); if( std::tr1::is_fundamental&lt;Derived&gt;::value ) throw MyService::Exceptions::ETypeTraitsInvalidArgument( "Derived class can't be POD" ); bool a = std::tr1::is_base_of&lt;Base, Derived&gt;::value; return a; } </code></pre> <p>and i have a such</p> <pre><code>bool a = std::is_base_of&lt;MyService::IBase, SomeInterface&gt;::value; // true a = IsDerivedFromBase&lt;MyService::IBase, SomeInterface&gt;(); // false </code></pre>
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    1. USdeeptowncitizen
    1. USdeeptowncitizen
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    1. COg++ 4.7.2 behaves as expected: http://ideone.com/8yrx6k
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      1. UShmjd
    2. COClang 4.0 behaves as expected.
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      1. USJames McLaughlin
    3. COPlease, next time, provide a compilable code that reproduces the problem. Just by compiling your code, you'll notice that it's syntactically incorrect.
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      1. USmfontanini
 

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