Fix docs

doc/api.rst

@@ -184,7 +184,7 @@ output ``operator<<`` when one is defined for a user-defined type.
 Output iterator support
 -----------------------
 
-.. doxygenfunction:: fmt::format_to(OutputIt, const S &, const Args &...)
+.. doxygenfunction:: fmt::format_to(OutputIt, const S&, const Args&...)
 .. doxygenfunction:: fmt::format_to_n(OutputIt, std::size_t, string_view, const Args&...)
 .. doxygenstruct:: fmt::format_to_n_result
    :members:

doc/build.py

@@ -93,7 +93,8 @@ def build_docs(version='dev', **kwargs):
                           FMT_API= \
                           "FMT_BEGIN_NAMESPACE=namespace fmt {{" \
                           "FMT_END_NAMESPACE=}}" \
-                          "FMT_STRING_ALIAS=1"
+                          "FMT_STRING_ALIAS=1" \
+                          "FMT_ENABLE_IF_T(B, T)=T"
       EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
     '''.format(include_dir, doxyxml_dir).encode('UTF-8'))
   if p.returncode != 0:

include/fmt/format.h

@@ -165,6 +165,8 @@ FMT_END_NAMESPACE
 # define FMT_USE_TRAILING_RETURN 0
 #endif
 
+#define FMT_ENABLE_IF_T(B, T) typename std::enable_if<B, T>::type
+
 #ifndef FMT_USE_GRISU
 # define FMT_USE_GRISU 0
 //# define FMT_USE_GRISU std::numeric_limits<double>::is_iec559
@@ -3495,9 +3497,9 @@ inline typename std::enable_if<internal::is_output_iterator<OutputIt>::value,
  \endrst
  */
 template <typename OutputIt, typename S, typename... Args>
-inline typename std::enable_if<
+inline FMT_ENABLE_IF_T(
     internal::is_string<S>::value &&
-    internal::is_output_iterator<OutputIt>::value, OutputIt>::type
+    internal::is_output_iterator<OutputIt>::value, OutputIt)
     format_to(OutputIt out, const S &format_str, const Args &... args) {
   internal::check_format_string<Args...>(format_str);
   typedef typename format_context_t<OutputIt, FMT_CHAR(S)>::type context;
@@ -3551,10 +3553,10 @@ inline typename std::enable_if<
  \endrst
  */
 template <typename OutputIt, typename S, typename... Args>
-inline typename std::enable_if<
+inline FMT_ENABLE_IF_T(
     internal::is_string<S>::value &&
     internal::is_output_iterator<OutputIt>::value,
-    format_to_n_result<OutputIt>>::type
+    format_to_n_result<OutputIt>)
     format_to_n(OutputIt out, std::size_t n, const S &format_str,
                 const Args &... args) {
   internal::check_format_string<Args...>(format_str);