Add missing include

external/fastlib/README.md

@@ -25,3 +25,22 @@
    }
   ```
 * **fast_split.hpp**: Yeah, idea same with ```fast_csv.hpp```
+  ```cpp
+  std::string buffer = read_file("xxx.csv");
+  fastl::fast_split_of(buffer.c_str(), buffer.size(), "\r\n", [&](const char* v_start, const char* v_end, int /*delimChar*/) {
+    // do somethings, store or parse the column value
+    // std::string value(v_start, v_end);
+  });
+  ```
+  or
+  ```cpp
+  std::string buffer = read_file("xxx.csv");
+  if(!buffer.empty()) {
+    fastl::fast_split_of(&buffer.front(), buffer.size(), "\r\n", [&](char* v_start, char* v_end, int /*delimChar*/) {
+      // if item is int or double, is more Memory Efficient parse it directly
+      char endch = *v_end; // store the last char in the streaming
+      *v_end = '\0';
+      int key = atoi(v_start); // parse int value directly
+      *v_end = endch; // restore rthe last char in the stream
+    });
+  ```

external/fastlib/fast_split.hpp

@@ -27,6 +27,7 @@
 #define SIMDSOFT_FAST_SPLIT_HPP
 #include <string.h>
 #include <string>
+#include <vector>
 
 namespace fastl {
 namespace internal {