Set primary domain to cpp

doc/conf.py

@@ -106,6 +106,8 @@ pygments_style = 'sphinx'
 
 highlight_language = 'c++'
 
+primary_domain = 'cpp'
+
 # A list of ignored prefixes for module index sorting.
 #modindex_common_prefix = []
 

doc/reference.rst

@@ -93,7 +93,7 @@ Custom allocators
 
 The C++ Format library supports custom dynamic memory allocators.
 A custom allocator class can be specified as a template argument to
-:cpp:class:`fmt::BasicMemoryWriter`::
+:class:`fmt::BasicMemoryWriter`::
 
     typedef fmt::BasicMemoryWriter<char, CustomAllocator> CustomMemoryWriter;