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#include <fruit/fruit.h>
#include <iostream>
using fruit::Component;
using fruit::Injector;
class Writer {
public:
virtual void write(std::string s) = 0;
};
class StdoutWriter : public Writer {
public:
// Like "StdoutWriter() = default;" but also marks this constructor as the
// one to use for injection.
INJECT(StdoutWriter()) = default;
virtual void write(std::string s) override {
std::cout << s;
}
};
class Greeter {
public:
virtual void greet() = 0;
};
class GreeterImpl : public Greeter {
private:
Writer* writer;
public:
// Like "GreeterImpl(Writer* writer) {...}" but also marks this constructor
// as the one to use for injection.
INJECT(GreeterImpl(Writer* writer)) : writer(writer) {}
virtual void greet() override {
writer->write("Hello world!\n");
}
};
Component<Greeter> getGreeterComponent() {
return fruit::createComponent().bind<Writer, StdoutWriter>().bind<Greeter, GreeterImpl>();
}
int main() {
Injector<Greeter> injector(getGreeterComponent);
Greeter* greeter = injector.get<Greeter*>();
greeter->greet();
return 0;
}
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