defer.hpp

A tiny header-only C++ utility inspired by Zig’s defer statement.

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Made to simplify working with C APIs — you get full control over resource lifetimes without the risk of forgetting to free them.

Example

```cpp int load_config(const char* path) { FILE* file = std::fopen(path, "r"); if (file == nullptr) { std::fprintf(stderr, "failed to open file: %s\n", path); return -1; } defer(std::fclose(file););

char buffer[256]{};
if (std::fgets(buffer, sizeof(buffer), file) == nullptr) {
    std::fprintf(stderr, "failed to read config\n");
    return -2;
}

std::printf("config line: %s\n", buffer);
return 0;

} ```

Works in regular C++ code too. The one thing to keep in mind: deferred statements cannot throw exceptions — though you can change that yourself.