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