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    <p>There's no specific mechanism for doing this directly in the current C++, but there are several ways you can achieve something like it at the cost of some boiler-plate work:</p> <p>Method 1:</p> <pre><code>// foo.h class Foo { private: // stuff public: // stuff private: // All this crap is private. Pretend like I didn't expose it. // yeah, I know, you have to compile it, and it probably adds // dependencies you don't want to #include, like &lt;string&gt; // or boost, but suck it up, cupcake. Stroustrup hates life. void internalHelper(std::string&amp;, std::vector&amp;, boost::everything&amp;); }; </code></pre> <p>Method 2:</p> <pre><code>// foo.h class Foo { private: // stuff public: // stuff }; // fooimpl.h // Internal file, do not export with the API. class FooImpl : public Foo { private: // stuff public: // stuff // So yeah, you have to go thru a cast and an extra include // if you want to access this. Suck it up, cupcake. void internalHelper(std::string&amp;, std::vector&amp;, boost::everything&amp;); }; </code></pre> <p>Method 3:</p> <pre><code>// foo.h class Foo { private: // stuff public: // stuff // For the private api: this is the worst approach, since it // exposes stuff and forces include/cruft on consumers. friend void foo_internalHelper(std::string&amp;, std::vector&amp;, boost::everything&amp;); }; // foo.cpp // don't make it static or anyone can make their own as a way to // back door into our class. void foo_internalHelper(...); </code></pre> <p>Method 4:</p> <pre><code>// foo.h class Foo { private: // stuff public: // stuff // No dependencies, but nothing stops an end-user from creating // a FooPrivate themselves... friend class FooPrivate; }; // foo1.cpp class FooPrivate { public: void fooInternalHelper(Foo* f) { f-&gt;m_privateInternalYouCantSeeMe = "Oh, but I can"; } }; </code></pre>
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    1. POAdd a method to existing C++ class in other file
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    1. COThis is too bad - I can't resist -1
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    2. CO@DieterLücking Which part?
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    3. COThe general hiccup !?
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