Web Reference: Jan 18, 2026 · However, one question often arises: Why does std::format throw exceptions at runtime for invalid format specifiers, instead of catching these errors during compilation? This blog dives into the technical, practical, and standardization reasons behind this design choice. May 20, 2025 · The format string fmt is checked at compile time unless it is initialized from the result of std::runtime_format(since C++26). If, at compile time, the format string is found to be invalid for the types of the arguments to be formatted, a compilation error will be emitted. Sep 27, 2025 · std::format is type-safe, which is great, but it means it must know how to format a type. You try to format your own class or struct, and the compiler yells at you with a long template error, saying something like "no matching function for call to std::formatter::format ".
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