compat.fmt

// compat.fmt's `c-api` feature: the two entry points of src/fmt-c.cc, called
// through fmt/fmt-c.h's `extern "C"` surface. Both are declared in the header,
// and only this TU (or a consumer's) can provide them — with the feature off
// this file does not link. See this member's mcpp.toml for why the calls are
// spelled this way instead of through the header's C-only fmt_format macro.
//
// Nothing here needs a file on disk: the format side is asserted in memory,
// and fmt_vprint runs against a stream the process owns (tmpfile is unlinked
// on close), so a passing test prints nothing.
#include <fmt/fmt-c.h>

#include <cstdio>
#include <string>

int main() {
    fmt_arg args[2] = {};
    args[0].type = fmt_cstring;
    args[0].value.cstring = "world";
    args[1].type = fmt_int;
    args[1].value.int_value = 42;

    const std::string expected = "hello world #42";
// …