C++26 introduces `#embed`, a preprocessor directive that embeds binary files directly into C++ programs as compile-time integer constant expressions. It replaces fragile build-system workarounds like `xxd -i`, `objcopy`, and custom scripts. The directive supports four parameters: `limit` (restrict byte count), `prefix`/`suffix` (wrap the embedded data), and `if_empty` (fallback for empty files). A companion `__has_embed` macro lets you conditionally embed based on resource availability. GCC 15 has full support; Clang 19+ supports it as a C23 extension. Benchmarks show dramatic compile-time improvements over xxd-generated headers — a 100 MB file embeds in ~1.3s vs 139s with the old approach.
Table of contents
The syntaxEmbed parameters__has_embedA realistic exampleCompiler support and compile timesConclusionConnect deeper335 Impressions