json: Add support for null

2 files changed, 11 insertions, 0 deletions

diff --git a/src/json.cc b/src/json.cc
index 46ea513..e8ddf52 100644
--- a/src/json.cc
+++ b/src/json.cc
@@ -62,6 +62,11 @@ class BaseWriter : public Writer {
     write(value);
   }
 
+  void value(std::nullptr_t) override {
+    before_value();
+    write(nullptr);
+  }
+
   void start_array() override {
     before_value();
     stack_.emplace_back(StackEntry::Type::kArray);
@@ -125,6 +130,7 @@ class BaseWriter : public Writer {
   virtual void write(bool value) = 0;
   virtual void write(char value) = 0;
   virtual void write(std::string_view value) = 0;
+  virtual void write(std::nullptr_t) = 0;
 
   void write(char const* value) { this->write(std::string_view(value)); }
 
@@ -225,6 +231,8 @@ class IosWriter : public BaseWriter {
 
   void write(char value) override { out_ << value; }
 
+  void write(std::nullptr_t) override { out_ << "null"; }
+
  private:
   std::ostream& out_;
 };
@@ -275,6 +283,8 @@ class StringWriter : public BaseWriter {
 
   void write(char value) override { out_.push_back(value); }
 
+  void write(std::nullptr_t) override { out_.append("null"); }
+
   void clear() override {
     BaseWriter::clear();
     out_.clear();
diff --git a/src/json.hh b/src/json.hh
index 609fc80..f2aae92 100644
--- a/src/json.hh
+++ b/src/json.hh
@@ -19,6 +19,7 @@ class Writer {
   virtual void value(float value) = 0;
   virtual void value(double value) = 0;
   virtual void value(bool value) = 0;
+  virtual void value(std::nullptr_t) = 0;
 
   void value(char const* value);
   void value(int32_t value);