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Adding comments for range formatting. (#2706)
* Adding comments for range formatting. * Adding missing quotes
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@ -350,7 +350,37 @@ are valid only for ``std::tm`` and not durations or time points.
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``std::tm`` uses the system's `strftime
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<https://en.cppreference.com/w/cpp/chrono/c/strftime>`_ so refer to its
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documentation for details on supported conversion specifiers.
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documentation for details on supported conversion specifiers.
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.. range-specs:
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Range Format Specifications
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===========================
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Format specifications for range types have the following syntax:
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..productionlist:: sf
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range_format_spec: [":" [`underlying_spec`]]
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The `underlying_spec` is parsed based on the formatter of the range's
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reference type.
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By default, a range of characters or strings is printed escaped and quoted. But
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if any `underlying_spec` is provided (even if it is empty), then the characters
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or strings are printed according to the provided specification.
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Examples:
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fmt::format("{}", std::vector{10, 20, 30});
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// Result: [10, 20, 30]
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fmt::format("{::#x}", std::vector{10, 20, 30});
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// Result: [0xa, 0x14, 0x13]
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fmt::format("{}", vector{'h', 'e', 'l', 'l', 'o'});
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// Result: ['h', 'e', 'l', 'l', 'o']
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fmt::format("{::}", vector{'h', 'e', 'l', 'l', 'o'});
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// Result: [h, e, l, l, o]
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fmt::format("{::d}", vector{'h', 'e', 'l', 'l', 'o'});
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// Result: [104, 101, 108, 108, 111]
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.. _formatexamples:
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