test_cppmacros.cxx

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#include <iostream>

#define FOO(TypeName,varname) \
    namespace FooBar {                                                  \
        void the##TypeName##func(TypeName var##varname) { std::cout << var##varname << std::endl; }}

FOO(int, INT)

int main()
{
    FooBar::theintfunc(42);
}