Embedding it in C++: A Modern Guide to Including Resources Historically, embedding raw data—like images, shaders, or configuration files—directly into a C++ binary was a painful process involving external tools like xxd to convert files into byte arrays.
With the evolution of C++, this has become cleaner and more efficient. The future holds even greater promise with the upcoming #embed preprocessor directive, often associated with C23 and likely to be standard in future C++ iterations. 1. The Future: #embed (C++23/C23)
The proposed #embed preprocessor directive is designed to be the modern, standard way to embed resources directly into a binary. It behaves much like #include, but instead of parsing text, it inserts the raw binary data of a file directly into a constexpr char array or similar container. Example Usage:
#include Use code with caution. Benefits: Native Support: No external scripts required.
Efficient: The compiler handles the resource embedding during compilation.
Clean Syntax: It solves the issues with older, more manual techniques. 2. The Current Standard: C++11 Raw String Literals
Before native #embed, developers often utilized C++11 raw string literals to include text-based resources (like shader code or SQL scripts) directly in the source file.
#include Use code with caution. Benefits: No external tools required.
Preserves special characters (newlines, quotes) without escaping. 3. Alternative Approaches (Pre-#embedEra)
For true binary data (images, audio), older projects often rely on xxd -i to convert a binary file into a header file containing a char array, which is then included in the project. Other alternatives include:
std::include techniques: Writing custom scripts to generate header files.
Linker tools: Using ld -r -b binary on Linux to embed files. Implementing #embed in Compilers (The Technical Details)
Implementing #embed in modern compilers (like Clang) involves treating the embedded file as a “memory buffer” that the compiler “enters” and parses, similar to how it handles a #include file. This makes it a seamless experience for build systems, requiring minimal updates to dependency generators (-MMD).
Today: Use C++11 raw strings for text, and tools like xxd -i or CMake custom commands for binary data.
Tomorrow: Utilize #embed for a standardized, clean, and portable approach to embedding resources directly into C++ binaries.
If you are interested in exploring how to use #embed in your own projects, I can explain: How to enable this feature in Clang The syntax for taking only partial data from a file
Alternative approaches for binary data, such as using xxd -i or linker tricks Implementing #embed for C and C++ | The Pasture