Sphinx can't parse user-defined literals

doc/api.rst

@@ -26,6 +26,8 @@ arguments in the resulting string.
 
 .. doxygenfunction:: format(CStringRef, ArgList)
 
+.. doxygenfunction:: operator""_format(const char *, std::size_t)
+
 .. _print:
 
 .. doxygenfunction:: print(CStringRef, ArgList)

doc/build.py

@@ -53,7 +53,8 @@ def build_docs():
       ALIASES          += "endrst=\endverbatim"
       PREDEFINED        = _WIN32=1 \
                           FMT_USE_VARIADIC_TEMPLATES=1 \
-                          FMT_USE_RVALUE_REFERENCES=1
+                          FMT_USE_RVALUE_REFERENCES=1 \
+                          FMT_USE_USER_DEFINED_LITERALS=1
       EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
     '''.format(os.path.dirname(doc_dir)))
   if p.returncode != 0:

doc/index.rst

@@ -165,7 +165,7 @@ Although the library uses C++11 features when available, it also works with olde
 compilers and standard library implementations. The only thing to keep in mind 
 for C++98 portability:
 
-* Variadic templates: minimum GCC 4.4, Clang 2.9 or VS2013. This feature allow 
+* Variadic templates: minimum GCC 4.4, Clang 2.9 or VS2013. This feature allows 
   the Format API to accept an unlimited number of arguments. With older compilers
   the maximum is 15.
 

format.h

@@ -3044,6 +3044,16 @@ struct UdlArg {
 
 inline namespace literals {
 
+/**
+  \rst
+  C++11 literal form of ``fmt::format``. 
+  Requires ``using namespace fmt::literals``.
+
+  **Example**::
+
+    std::string message = "The answer is {}"_format(42);
+  \endrst
+*/
 inline internal::UdlFormat<char>
 operator"" _format(const char *s, std::size_t) { return {s}; }
 inline internal::UdlFormat<wchar_t>