Use new simd library for scanning string literals

src/test.cpp

@@ -2,6 +2,7 @@
 #include <cctype>
 #include <cstdio>
 #include <cstring>
+#include <fstream>
 
 #include <limits>
 #include <string>
@@ -119,32 +120,11 @@
 
 namespace {
 
-const std::string json = R"({
-    "a number": 12345,
-    "true": true,
-    "false": false,
-    "null": null,
-    "glossary": {
-        "title": "example glossary",
-		"GlossDiv": {
-            "title": "S",
-			"GlossList": {
-                "GlossEntry": {
-                    "ID": "SGML",
-					"SortAs": "SGML",
-					"GlossTerm": "Standard Generalized Markup Language",
-					"Acronym": "SGML",
-					"Abbrev": "ISO 8879:1986",
-					"GlossDef": {
-                        "para": "A meta-markup language, used to create markup languages such as DocBook.",
-						"GlossSeeAlso": ["GML", "XML"]
-                    },
-					"GlossSee": "markup"
-                }
-            }
-        }
-    }
-})";
+const std::string json = []() {
+  std::ifstream infile{"test.json"};
+  return std::string{std::istreambuf_iterator<char>(infile),
+                     std::istreambuf_iterator<char>()};
+}();
 
 void testStreaming(std::string const &json) {
   SerializeState streaming;