lst-0603-book.cpp
// https://godbolt.org/z/bfofn76Ke
#include <iostream>
class Printer {
std::ostream& trg_;
public:
explicit Printer(std::ostream& target)
: trg_(target)
{}
template<typename TYP>
Printer& print(const TYP& arg) {
trg_ << arg;
return *this;
}
};
int main() {
Printer normal(std::cout);
normal.print(7).print(" ").print(3.1415).print("\n");
Printer fehler(std::cerr);
fehler.print(8).print(" ").print(2.7183).print("\n");
}