std::print (C++23)

TL;DR

Output formatted strings directly to stdout—a combination of printf + iostream + type safety, the new way to write Hello World in C++23.

Header

#include <print>

Core API Cheat Sheet

Operation	Signature	Description
Output to stdout	std::print(fmt, args...);	Format and output to standard output
Output with newline	std::println(fmt, args...);	Automatically append a newline character
Empty line	std::println();	Output only a newline character
Output to file	std::print(file, fmt, args...);	Output to a specified C file stream
Output to file with newline	std::println(file, fmt, args...);	Newline version
Output to stream	std::print(stream, fmt, args...);	Output to a C++ stream

Minimal Example

#include <print>

int main() {
    // Basic replacement
    std::print("Hello, {}!\n", "World");

    // Automatic newline
    std::println("The answer is {}", 42);

    // User-defined types (if formatter is specialized)
    // std::println("Point: {}", Point{10, 20});
}

Embedded Applicability: Low

• Relies on the OS and filesystem abstraction layer; bare-metal environments typically lack standard output.
• Suitable for logging in embedded Linux host tools or test frameworks.
• The formatting engine incurs significant Flash overhead; it is not recommended for resource-constrained devices.
• Use fmt library's fmt::print as a fallback option starting from C++11.

Compiler Support

GCC	Clang	MSVC
14	18	19.34

See Also

• cppreference: std::print

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