update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / describe / example / fmtlib_enum_formatter.cpp

diff --git a/ceph/src/boost/libs/describe/example/fmtlib_enum_formatter.cpp b/ceph/src/boost/libs/describe/example/fmtlib_enum_formatter.cpp
new file mode 100644 (file)
index 0000000..09e60f9
--- /dev/null
+++ b/ceph/src/boost/libs/describe/example/fmtlib_enum_formatter.cpp
@@ -0,0 +1,60 @@
+// Copyright 2022 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe.hpp>
+#include <fmt/format.h>
+#include <type_traits>
+
+template<class T> struct fmt::formatter<T, char, std::enable_if_t<
+    boost::describe::has_describe_enumerators<T>::value>>
+{
+private:
+
+    using U = std::underlying_type_t<T>;
+
+    fmt::formatter<fmt::string_view, char> sf_;
+    fmt::formatter<U, char> nf_;
+
+public:
+
+    constexpr auto parse( format_parse_context& ctx )
+    {
+        auto i1 = sf_.parse( ctx );
+        auto i2 = nf_.parse( ctx );
+
+        if( i1 != i2 )
+        {
+            ctx.error_handler().on_error( "invalid format" );
+        }
+
+        return i1;
+    }
+
+    auto format( T const& t, format_context& ctx ) const
+    {
+        char const * s = boost::describe::enum_to_string( t, 0 );
+
+        if( s )
+        {
+            return sf_.format( s, ctx );
+        }
+        else
+        {
+            return nf_.format( static_cast<U>( t ), ctx );
+        }
+    }
+};
+
+enum E1
+{
+    v1, v2, v3 = 11
+};
+
+BOOST_DESCRIBE_ENUM( E1, v1, v2, v3 )
+
+int main()
+{
+    fmt::print( "{:_^10}\n", E1::v1 );
+    fmt::print( "{:_^10}\n", (E1)7 );
+}