[ostream::sentry] - C++17 → C++20

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tmp/tmpj27c7wym/{from.md → to.md} RENAMED Viewed

@@ -1,48 +0,0 @@
-##### Class `basic_ostream::sentry` <a id="ostream::sentry">[[ostream::sentry]]</a>
-``` cpp
-namespace std {
-  template <class charT, class traits = char_traits<charT>>
-  class basic_ostream<charT, traits>::sentry {
-    bool ok_; // exposition only
-  public:
-    explicit sentry(basic_ostream<charT, traits>& os);
-    ~sentry();
-    explicit operator bool() const { return ok_; }
-    sentry(const sentry&) = delete;
-    sentry& operator=(const sentry&) = delete;
-  };
-}
-```
-The class `sentry` defines a class that is responsible for doing
-exception safe prefix and suffix operations.
-``` cpp
-explicit sentry(basic_ostream<charT, traits>& os);
-```
-If `os.good()` is nonzero, prepares for formatted or unformatted output.
-If `os.tie()` is not a null pointer, calls `os.tie()->flush()`.[^31]
-If, after any preparation is completed, `os.good()` is `true`,
-`ok_ == true` otherwise, `ok_ == false`. During preparation, the
-constructor may call `setstate(failbit)` (which may throw
-`ios_base::failure` ([[iostate.flags]]))[^32]
-``` cpp
-~sentry();
-```
-If
-`(os.flags() & ios_base::unitbuf) && !uncaught_exceptions() && os.good()`
-is `true`, calls `os.rdbuf()->pubsync()`. If that function returns -1,
-sets `badbit` in `os.rdstate()` without propagating an exception.
-``` cpp
-explicit operator bool() const;
-```
-*Effects:* Returns `ok_`.

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