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Should a std::basic_format_string be specified?

From: Joseph Thomson <joseph.thomson_at_[hidden]>
Date: Thu, 2 Dec 2021 19:38:25 +0000
 The adopted proposal, P2216R3
modified std::format to take an initial *basic-format-string* parameter so
that type checking could be performed at compile time. The proposal chose
to make the type of the argument parameter unspecified as it considered it
an implementation detail. However, consider the common use case:

template <typename... Args>void log(std::format_string<Args...> s,
Args&&... args) {
    if (logging_enabled) {
        log_raw(std::format(s, std::forward<Args>(args)...));

Without a specified std::format_string type, is it possible to forward
arguments to std::format with compile-time format string checks? I'm
thinking about this as an average user of the standard library, so I'm
not looking for workarounds. Is this a defect?

Received on 2021-12-02 13:39:03