| 149 | |
| 150 | template <typename OutputIt, typename... T> |
| 151 | constexpr auto format(OutputIt out, const T&...) const -> OutputIt { |
| 152 | *out++ = value; |
| 153 | return out; |
| 154 | } |
| 155 | }; |
| 156 | |
| 157 | // This ensures that the argument type is convertible to `const T&`. |
nothing calls this directly
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