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(C++) 'MyPolicy::MyMethod' is not a direct base class of 'MyClass<MyPolicy>'

Compile error.

Full error message

[C++ Error] UnitMain.cpp(4): E2507 'MyPolicy::MyMethod' is not a direct base class of 'MyClass<MyPolicy>'

Cause

IDE: C++ Builder 6.0

Compiler: Borland BCC32.EXE version 6.0.10.157

template <typename MyPolicy>

struct MyClass : public MyPolicy

{

using MyPolicy::MyMethod;

};

This example is simplified from the example at the WikiPedia page about policy-based design.

The same code does compile using the IDE Dev-C++ version 4.9.9.2 its default compiler.

Solution

By removing the using statement, it will work.

template <typename MyPolicy>

struct MyClass : public MyPolicy

{

};

Policies requires a compiler with highly robust support for templates [0] .

References

[0]          The WikiPedia page about policy-based design

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