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While answering this question about printing a 2D array of strings into a table, I realized:
I haven't found a better way to determine the length of the result of a fmt::format call that to actually format into a string and check the length of that string.
Is that by design, or is there a more efficient way to go about that? I don't know the internals of fmtlib all too well, but I imagine, the length of the result is known before memory allocation happens. I'd especially like to avoid the memory allocation.
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{fmt} is an open-source formatting library providing a fast and safe alternative to C stdio and C++ iostreams.
To use the {fmt} library, add fmt/core. h , fmt/format. h , fmt/format-inl. h , src/format.cc and optionally other headers from a release archive or the Git repository to your project.
fmtstr or sequence of strs, optional. A single format (%10.5f), a sequence of formats, or a multi-format string, e.g. 'Iteration %d – %10.5f', in which case delimiter is ignored. For complex X, the legal options for fmt are: a single specifier, fmt='%.
Use the FMT function or a format expression to format data for output. Any BASIC expression can be formatted for output by following it with a format expression. expression evaluates to the numeric or string value to be formatted. format is an expression that evaluates to a string of formatting codes. The syntax of the format expression is:
This may cause truncation of data. If you SET the table with the longer length and format first, then the result has the longer format. No problems or warnings with that, because you can always fit the smaller values into a larger space, just not vice versa. SAS formats are extremely powerful.
A basic attribute of a format is the format length, which controls how much of the value is displayed. For example, a character column might have a storage length of 10 bytes, but a format length of 5 characters ($5. format), so when you see the formatted values you will see at most 5 characters for each record.
To use the distance formula to find the length of a line, start by finding the coordinates of the line segment's endpoints. Then, plug the coordinates into the distance formula. Next, subtract the numbers in parenthesis and then square the differences. Once you've done that, just add the numbers that are under the radical sign and solve for d.
Straight from the API documentation:
template<typename ...T> auto fmt::formatted_size(format_string<T...> fmt, T&&... args) -> size_tReturns the number of chars in the output of
format(fmt, args...).
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