Add pointer support to basic_writer

include/fmt/format.h

@@ -2553,6 +2553,14 @@ class basic_writer {
   void write(basic_string_view<char_type> str, FormatSpecs... specs) {
     write_str(str, format_specs(specs...));
   }
+
+  template <typename T>
+  typename std::enable_if<std::is_same<T, void>::value>::type write(const T* p) {
+    format_specs specs;
+    specs.flags_ = HASH_FLAG;
+    specs.type_ = 'x';
+    write_int(reinterpret_cast<uintptr_t>(p), specs);
+  }
 };
 
 template <typename Range>

test/format-test.cc

@@ -1609,6 +1609,7 @@ TEST(FormatTest, UdlTemplate) {
 
 TEST(FormatTest, ToString) {
   EXPECT_EQ("42", fmt::to_string(42));
+  EXPECT_EQ("0x1234", fmt::to_string(reinterpret_cast<void*>(0x1234)));
 }
 
 TEST(FormatTest, ToWString) {