std::print (C++23)

TL;DR

Writes formatted strings straight to stdout — std::format and std::cout rolled into one, the new way to write Hello World in C++23.

Header

#include <print>

Core API Cheat Sheet

Operation	Signature	Description
Output to stdout	void print(format_string, args...)	Formats and writes to standard output
Output with newline	void println(format_string, args...)	Automatically appends a newline
Blank line	void println()	Outputs just a newline character
Output to file	void print(FILE* f, format_string, args...)	Writes to a given C file stream
Output to file with newline	void println(FILE* f, format_string, args...)	Newline version
Output to stream	void vprint_unicode(std::ostream&, std::format_args)	Writes to a C++ stream

Minimal Example

// Standard: C++23
#include <print>

int main() {
    std::print("Hello, {}!\n", "world");
    std::println("value = {}", 42);
    std::println("{:>10.2f}", 3.14159); //       3.14
    std::println();                      // blank line
}

Embedded Applicability: Low

• Depends on stdout and the filesystem abstraction layer; bare-metal environments usually have no standard output
• A good fit for log output in embedded Linux host-side tools and test frameworks
• The formatting engine carries significant Flash overhead; not recommended for extremely resource-constrained devices
• You can fall back to fmt::print from the {fmt} library, available since C++11

Compiler Support

GCC	Clang	MSVC
14	18	19.34

See Also

• cppreference: std::print

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