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crtp.cpp
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crtp.cpp
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#include "common.h"
#include <iostream>
template <typename Implementation>
class CRTPInterface {
public:
void tick(uint64_t n) {
impl().tick(n);
}
uint64_t getvalue() {
return impl().getvalue();
}
private:
Implementation& impl() {
return *static_cast<Implementation*>(this);
}
};
class CRTPImplementation : public CRTPInterface<CRTPImplementation> {
uint64_t counter;
public:
CRTPImplementation()
: counter(0) {
}
void tick(uint64_t n) {
counter += n;
}
uint64_t getvalue() {
return counter;
}
};
template <typename Implementation>
void run_crtp(CRTPInterface<Implementation>* obj) {
for (unsigned i = 0; i < N; ++i) {
for (unsigned j = 0; j < i; ++j) {
obj->tick(j);
}
}
}
int main() {
auto obj = new CRTPInterface<CRTPImplementation>();
run_crtp(obj);
std::cout << "counter=" << obj->getvalue() << "\n";
return 0;
}