fix: mask exceptions when trying to parse a number

fix #58

Author: hjiang

jsonxx.cc

@@ -182,9 +182,26 @@ bool parse_identifier(std::istream& input, String& value) {
     }
 }
 
+class IOStateMasker {
+    public:
+    explicit IOStateMasker(std::istream& input): stream(input) {
+       mask = input.exceptions();
+       input.exceptions(0);
+    }
+
+    ~IOStateMasker() {
+        stream.exceptions(mask);
+    }
+
+    private:
+    std::istream& stream;
+    std::istream::iostate mask;
+};
+
 bool parse_number(std::istream& input, Number& value) {
     input >> std::ws;
     std::streampos rollback = input.tellg();
+    IOStateMasker masker(input);
     input >> value;
     if (input.fail()) {
         input.clear();

jsonxx_test.cc

@@ -120,6 +120,16 @@ int main(int argc, const char **argv) {
         Object o;
         TEST(o.parse(input));
     }
+    {
+        string teststr("{ \"field1\" : true }");
+        istringstream input(teststr);
+        istringstream::iostate old_mask = input.exceptions();
+        input.exceptions(istringstream::eofbit | istringstream::failbit |
+                         istringstream::badbit);
+        Object o;
+        TEST(o.parse(input));
+        input.exceptions(old_mask);
+    }
     {
         string teststr("{ \"field1 : 6 }");
         istringstream input(teststr);