fix

fuzz/from_chars.cc

@@ -27,8 +27,12 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   auto answer =
       fast_float::from_chars(input_d.data(), input_d.data() + input_d.size(), result_d, format);
   std::string input_f = fdp.ConsumeRandomLengthString(128);
-  double result_f = 0.0;
+  float result_f = 0.0;
   answer =
       fast_float::from_chars(input_f.data(), input_f.data() + input_f.size(), result_f, format);
+  int result_i = 0;
+  std::string input_i = fdp.ConsumeRandomLengthString(128);
+  answer =
+      fast_float::from_chars(input_i.data(), input_i.data() + input_i.size(), result_i);
   return 0;
 }

tests/fast_int.cpp

@@ -1,4 +1,20 @@
-#if defined(__cplusplus) && (__cplusplus >= 201703L)
+#ifndef __cplusplus
+#error fastfloat requires a C++ compiler
+#endif
+
+// We want to enable the tests only for C++17 and above.
+#ifndef FASTFLOAT_CPLUSPLUS
+#if defined(_MSVC_LANG) && !defined(__clang__)
+#define FASTFLOAT_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG)
+#else
+#define FASTFLOAT_CPLUSPLUS __cplusplus
+#endif
+#endif
+
+
+#if FASTFLOAT_CPLUSPLUS >= 201703L
+
+
 #include <cstdlib>
 #include <iostream>
 #include <vector>
@@ -744,6 +760,9 @@ int main() {
   return EXIT_SUCCESS;
 }
 #else
+#include <iostream>
+#include <cstdlib>
+
 int main() {
   std::cerr << "The test requires C++17." << std::endl;
   return EXIT_SUCCESS;