tmp/tmpuvzkogzk/{from.md → to.md}
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| 1 |
+
##### Print <a id="ostream.formatted.print">[[ostream.formatted.print]]</a>
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``` cpp
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| 4 |
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template<class... Args>
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void print(ostream& os, format_string<Args...> fmt, Args&&... args);
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```
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*Effects:* If the ordinary literal encoding [[lex.charset]] is UTF-8,
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equivalent to:
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``` cpp
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vprint_unicode(os, fmt.str, make_format_args(std::forward<Args>(args)...));
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```
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Otherwise, equivalent to:
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``` cpp
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vprint_nonunicode(os, fmt.str, make_format_args(std::forward<Args>(args)...));
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```
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``` cpp
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template<class... Args>
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void println(ostream& os, format_string<Args...> fmt, Args&&... args);
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```
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*Effects:* Equivalent to:
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``` cpp
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print(os, "{}\n", format(fmt, std::forward<Args>(args)...));
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| 30 |
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```
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``` cpp
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void vprint_unicode(ostream& os, string_view fmt, format_args args);
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| 34 |
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void vprint_nonunicode(ostream& os, string_view fmt, format_args args);
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```
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*Effects:* Behaves as a formatted output
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function [[ostream.formatted.reqmts]] of `os`, except that:
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- failure to generate output is reported as specified below, and
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| 41 |
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- any exception thrown by the call to `vformat` is propagated without
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| 42 |
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regard to the value of `os.exceptions()` and without turning on
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| 43 |
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`ios_base::badbit` in the error state of `os`.
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| 44 |
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| 45 |
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After constructing a `sentry` object, the function initializes an
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| 46 |
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automatic variable via
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| 47 |
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| 48 |
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``` cpp
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| 49 |
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string out = vformat(os.getloc(), fmt, args);
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| 50 |
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```
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| 51 |
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If the function is `vprint_unicode` and `os` is a stream that refers to
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| 53 |
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a terminal capable of displaying Unicode which is determined in an
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| 54 |
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implementation-defined manner, writes `out` to the terminal using the
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| 55 |
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native Unicode API; if `out` contains invalid code units, the behavior
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| 56 |
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is undefined and implementations are encouraged to diagnose it. If the
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| 57 |
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native Unicode API is used, the function flushes `os` before writing
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| 58 |
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`out`. Otherwise (if `os` is not such a stream or the function is
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| 59 |
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`vprint_nonunicode`), inserts the character sequence \[`out.begin()`,
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| 60 |
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`out.end()`) into `os`. If writing to the terminal or inserting into
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| 61 |
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`os` fails, calls `os.setstate(ios_base::badbit)` (which may throw
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`ios_base::failure`).
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| 63 |
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| 64 |
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*Recommended practice:* For `vprint_unicode`, if invoking the native
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| 65 |
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Unicode API requires transcoding, implementations should substitute
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| 66 |
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invalid code units with U+fffd (replacement character) per the Unicode
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| 67 |
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Standard, Chapter 3.9 ‘U+fffd‘ Substitution in Conversion.
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| 68 |
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