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Docs: add comment about empty format context range

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Alex 2022-06-02 21:38:15 +07:00 committed by Victor Zverovich
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commit 8644654190
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doc/api.rst
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@ -210,6 +210,10 @@ template and implement ``parse`` and ``format`` methods::
// the formatter should parse the 'f' specifier and return an iterator // the formatter should parse the 'f' specifier and return an iterator
// pointing to '}'. // pointing to '}'.
// Please also note that this character range may be empty, in case of
// the "{}" format string, so therefore you should check ctx.begin()
// for equality with ctx.end().
// Parse the presentation format and store it in the formatter: // Parse the presentation format and store it in the formatter:
auto it = ctx.begin(), end = ctx.end(); auto it = ctx.begin(), end = ctx.end();
if (it != end && (*it == 'f' || *it == 'e')) presentation = *it++; if (it != end && (*it == 'f' || *it == 'e')) presentation = *it++;