An elegant and conceptually interesting CRTP-based C++ printer using SFINAE for compile-time static dispatch of variadic arguments.

unrays_printer.cpp

// Copyright (c) December 2025 Félix-Olivier Dumas. All rights reserved.
// Licensed under the terms described in the LICENSE file

template<typename Variation>
class IPrinter {
public:
    template<typename... Args>
    auto print(Args&&... args) noexcept ->
        std::enable_if_t<std::is_void_v
            <decltype(std::declval<Variation>().print(std::declval<Args>()...))>,
        void> { static_cast<Variation*>(this)->print(std::forward<Args>(args)...); }
};

class ConsolePrinter : public IPrinter<ConsolePrinter> {
public:
    template<typename T>
    void print(const T& printable) const noexcept {
        std::cout << printable << std::endl;
    }
};

int main() {
    IPrinter<ConsolePrinter> consolePrinter;

    consolePrinter.print("Hello World!");
    consolePrinter.print(67);
}