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> The two functions have different prototypes, I thought that the compiler was
able to differentiate them.
Different prototypes, but the same name. The name is what is causing the
error, not the rest of the signature.
To avoid this kind of situation, I recommend using a different method name
for the method with the different signature.
>Then it compiles but there is a *link* error ! Can somebody explain me what
happens ?
You have not defined the a::foo function anywhere. So there is a link error.
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