release 4.0.5

* allow string reuse

* portability fix

* using data and not begin

.github/workflows/ubuntu24-noexcept.yml

@@ -31,4 +31,4 @@ jobs:
           echo -e '#include <simdjson.h>\nint main(int argc,char**argv) {simdjson::dom::parser parser;simdjson::dom::element tweets = parser.load(argv[1]); }' > tmp.cpp && c++ -Idestination/include -Ldestination/lib -std=c++17 -Wl,-rpath,destination/lib -o linkandrun tmp.cpp -lsimdjson && ./linkandrun jsonexamples/twitter.json &&
           mkdir testfindpackage &&
           cd testfindpackage &&
-          echo -e 'cmake_minimum_required(VERSION 3.1)\nproject(simdjsontester)\nset(CMAKE_CXX_STANDARD 17)\nfind_package(simdjson REQUIRED)'> CMakeLists.txt && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=../destination .. &&  cmake --build .
+          echo -e 'cmake_minimum_required(VERSION 3.14)\nproject(simdjsontester)\nset(CMAKE_CXX_STANDARD 17)\nfind_package(simdjson REQUIRED)'> CMakeLists.txt && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=../destination .. &&  cmake --build .

.github/workflows/ubuntu24-nothread.yml

@@ -31,4 +31,4 @@ jobs:
           echo -e '#include <simdjson.h>\nint main(int argc,char**argv) {simdjson::dom::parser parser;simdjson::dom::element tweets = parser.load(argv[1]); }' > tmp.cpp && c++ -Idestination/include -Ldestination/lib -std=c++17 -Wl,-rpath,destination/lib -o linkandrun tmp.cpp -lsimdjson && ./linkandrun jsonexamples/twitter.json &&
           mkdir testfindpackage &&
           cd testfindpackage &&
-          echo -e 'cmake_minimum_required(VERSION 3.1)\nproject(simdjsontester)\nset(CMAKE_CXX_STANDARD 17)\nfind_package(simdjson REQUIRED)'> CMakeLists.txt && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=../destination .. &&  cmake --build .
+          echo -e 'cmake_minimum_required(VERSION 3.14)\nproject(simdjsontester)\nset(CMAKE_CXX_STANDARD 17)\nfind_package(simdjson REQUIRED)'> CMakeLists.txt && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=../destination .. &&  cmake --build .

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.14)
 project(
     simdjson
     # The version number is modified by tools/release.py
-    VERSION 4.0.3
+    VERSION 4.0.5
     DESCRIPTION "Parsing gigabytes of JSON per second"
     HOMEPAGE_URL "https://simdjson.org/"
     LANGUAGES CXX C

Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = simdjson
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "4.0.3"
+PROJECT_NUMBER         = "4.0.5"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

README.md

@@ -62,6 +62,7 @@ Real-world usage
 - [WasmEdge](https://wasmedge.org)
 - [RonDB](https://github.com/logicalclocks/rondb)
 - [GreptimeDB](https://github.com/GreptimeTeam/greptimedb)
+- [mamba](https://github.com/mamba-org/mamba)
 
 
 If you are planning to use simdjson in a product, please work from one of our releases.
@@ -120,7 +121,6 @@ Some users may want to browse code along with the compiled assembly. You want to
 * [C++26 reflection example](https://godbolt.org/z/K3Px64TqK)
 * [simdjson examples with errors handled through exceptions](https://godbolt.org/z/7G5qE4sr9)
 * [simdjson examples with errors without exceptions](https://godbolt.org/z/e9dWb9E4v)
- 
 
 Performance results
 -------------------

doc/basics.md

@@ -1477,6 +1477,12 @@ type without a document instance like so:
 Car car = simdjson::from(json);
 ```
 
+You can also use the `simdjson::from` syntax without exceptions, like so:
+```cpp
+Car car;
+simdjson::error_code err = simdjson::from(json_car).get(car);
+```
+
 You can also use the `simdjson::from` syntax to iterate over an array.
 
 ```cpp

doc/builder.md

@@ -34,12 +34,13 @@ It has the following methods to add content to the string:
 - `append_null()`: Appends the string "null" to the JSON buffer.
 - `clear()`: Clears the contents of the JSON buffer, resetting the position to 0 while retaining the allocated capacity.
 - `escape_and_append(std::string_view input)`: Appends a string view to the JSON buffer after escaping special characters (e.g., quotes, backslashes) as required by JSON.
-- `escape_and_append_with_quotes(std::string_view input)` Appends a string view surrounded by double quotes (e.g., "input") to the JSON buffer after escaping special characters.
-Parameters:
+- `escape_and_append_with_quotes(std::string_view input)` Appends a string view surrounded by double quotes (e.g., "input") to the JSON buffer after escaping special characters. For constant strings, you may also do `escape_and_append_with_quotes<"mystring">()`.
 - `escape_and_append_with_quotes(char input)`: Appends a single character surrounded by double quotes (e.g., "c") to the JSON buffer after escaping it if necessary.
 - `append_raw(const char *c)`: Appends a null-terminated C string directly to the JSON buffer without escaping.
 - `append_raw(std::string_view input)`: Appends a string view directly to the JSON buffer without escaping.
 - `append_raw(const char *str, size_t len)`: Appends a specified number of characters from a C string directly to the JSON
+- `append_key_value(key,value)`: Appends a key and a value (`"json":somevalue`)
+- `append_key_value<"mykey">(value)`: Appends a key and a value (`"json":somevalue`), useful when the key is a compile-time constant (C++20).
 
 After writing the content, if you have reasons to believe that the content might violate UTF-8 conventions, you can check it as follows:
 
@@ -52,7 +53,7 @@ Once you are satisfied, you can recover the string as follows:
 
 - `operator std::string()`: Converts the JSON buffer to an std::string. (Might throw if an error occurred.)
 - `operator std::string_view()`: Converts the JSON buffer to an std::string_view.  (Might throw if an error occurred.)
-- `view()`: Returns a view of the written JSON buffer as a `simdjson_result<std::string_view>`.
+- `view()`: Returns a view of the written JSON buffer as a `simdjson_result<std::string_view>` (C++20).
 
 The later method (`view()`) is recommended.  For performance reasons, we expect you to explicitly call `validate_unicode()` as needed (e.g., prior to calling `view()`).
 
@@ -131,20 +132,20 @@ In all cases, the `std::string_view` instance depends the corresponding `string_
 
 
 
-If you have C++20, you can simplify the code, as the `std::vector<double>` is automatically
-supported.
+If you have C++20, you can simplify the code, as the `std::vector<double>` is automatically supported. Further, we can pass the keys (which are compile-time
+constant) as template parameter (for improved performance).
 
 ```cpp
     Car c = {"Toyota", "Corolla", 2017, {30.0,30.2,30.513,30.79}};
     simdjson::builder::string_builder sb;
     sb.start_object();
-    sb.append_key_value("make", c.make);
+    sb.append_key_value<"make">(c.make);
     sb.append_comma();
-    sb.append_key_value("model", c.model);
+    sb.append_key_value<"model">(c.model);
     sb.append_comma();
-    sb.append_key_value("year", c.year);
+    sb.append_key_value<"year">(c.year);
     sb.append_comma();
-    sb.append_key_value("tire_pressure", c.tire_pressure);
+    sb.append_key_value<"tire_pressure">(c.tire_pressure);
     sb.end_object();
     std::string_view p = sb.view();
 ```
@@ -175,6 +176,17 @@ std::vector<std::vector<double>> c = {{1.0, 2.0}, {3.0, 4.0}};
 std::string json = simdjson::to_json(c);
 ```
 
+We also have an overload for when you want to reuse the same `std::string` instance:
+
+
+```cpp
+std::vector<std::vector<double>> c = {{1.0, 2.0}, {3.0, 4.0}};
+std::string json;
+auto error = simdjson::to_json(c, json);
+if(error) { /* there was an error */ }
+```
+
+
 We do recommend that you create and reuse the `string_builder` instance for performance
 reasons.
 
@@ -239,7 +251,17 @@ with the `simdjson::to_json` template function.
 If you know the output size, in bytes, of your JSON string, you may
 pass it as a second parameter (e.g., `simdjson::to_json(c, 31123)`).
 
+Sometimes you may want to reuse the same `std::string` instance. We
+have an overload for this purpose:
 
+```cpp
+Car c = {"Toyota", "Corolla", 2017, {30.0,30.2,30.513,30.79}};
+std::string s;
+auto error = simdjson::to_json(c, s);
+if(error) { /* there was an error */ }
+```
+
+You can then also add a third parameter for the expected output size in bytes.
 
 ### Without `string_buffer` instance but with explicit error handling
 
@@ -248,7 +270,7 @@ pattern:
 
 ```cpp
   std::string json;
-  if(simdjson::to(c).get(json)) {
+  if(simdjson::to_json(c).get(json)) {
     // there was an error
   } else {
     // json contain the serialized JSON

include/simdjson/convert-inl.h

@@ -58,6 +58,12 @@ inline simdjson_result<T> auto_parser<parser_type>::result() noexcept(is_nothrow
   return m_doc.get<T>();
 }
 
+template <typename parser_type>
+template <typename T>
+simdjson_warn_unused simdjson_inline error_code auto_parser<parser_type>::get(T &value) && noexcept(is_nothrow_gettable<T>) {
+  return result<T>().get(value);
+}
+
 template <typename parser_type>
 inline simdjson_result<ondemand::array> auto_parser<parser_type>::array() noexcept {
   return result<ondemand::array>();
@@ -73,12 +79,6 @@ inline simdjson_result<ondemand::number> auto_parser<parser_type>::number() noex
   return result<ondemand::number>();
 }
 
-template <typename parser_type>
-template <typename T>
-inline auto_parser<parser_type>::operator simdjson_result<T>() noexcept(is_nothrow_gettable<T>) {
-  return result<T>();
-}
-
 template <typename parser_type>
 template <typename T>
 inline auto_parser<parser_type>::operator T() noexcept(false) {

include/simdjson/convert.h

@@ -46,14 +46,16 @@ public:
 
 	template <typename T>
 	simdjson_warn_unused simdjson_inline simdjson_result<T> result() noexcept(is_nothrow_gettable<T>);
+	template <typename T>
+	simdjson_warn_unused simdjson_inline error_code get(T &value) && noexcept(is_nothrow_gettable<T>);
+
 
 	simdjson_warn_unused simdjson_inline simdjson_result<ondemand::array> array() noexcept;
 	simdjson_warn_unused simdjson_inline simdjson_result<ondemand::object> object() noexcept;
 	simdjson_warn_unused simdjson_inline simdjson_result<ondemand::number> number() noexcept;
 
-	template <typename T>
-	simdjson_warn_unused simdjson_inline explicit(false) operator simdjson_result<T>() noexcept(is_nothrow_gettable<T>);
-
+	//template <typename T>
+	//simdjson_warn_unused simdjson_inline explicit(false) operator simdjson_result<T>() noexcept(is_nothrow_gettable<T>);
 	template <typename T>
 	simdjson_warn_unused simdjson_inline explicit(false) operator T() noexcept(false);
 

include/simdjson/generic/ondemand/json_builder.h

@@ -263,7 +263,7 @@ void append(string_builder &b, const Z &z) {
 }
 
 template <class Z>
-simdjson_result<std::string> to_json_string(const Z &z, size_t initial_capacity = 1024) {
+simdjson_warn_unused simdjson_result<std::string> to_json_string(const Z &z, size_t initial_capacity = string_builder::DEFAULT_INITIAL_CAPACITY) {
   string_builder b(initial_capacity);
   append(b, z);
   std::string_view s;
@@ -272,8 +272,8 @@ simdjson_result<std::string> to_json_string(const Z &z, size_t initial_capacity
 }
 
 template <class Z>
-simdjson_error to_json(const Z &z, std::string &s) {
-  string_builder b;
+simdjson_warn_unused simdjson_error to_json(const Z &z, std::string &s, size_t initial_capacity = string_builder::DEFAULT_INITIAL_CAPACITY) {
+  string_builder b(initial_capacity);
   append(b, z);
   std::string_view view;
   if(auto e = b.view().get(view); e) { return e; }
@@ -290,9 +290,13 @@ string_builder& operator<<(string_builder& b, const Z& z) {
 } // namespace SIMDJSON_IMPLEMENTATION
 // Alias the function template to 'to' in the global namespace
 template <class Z>
-simdjson_result<std::string> to_json(const Z &z, size_t initial_capacity = 1024) {
+simdjson_warn_unused simdjson_result<std::string> to_json(const Z &z, size_t initial_capacity = SIMDJSON_IMPLEMENTATION::builder::string_builder::DEFAULT_INITIAL_CAPACITY) {
   return SIMDJSON_IMPLEMENTATION::builder::to_json_string(z, initial_capacity);
 }
+template <class Z>
+simdjson_warn_unused simdjson_error to_json(const Z &z, std::string &s, size_t initial_capacity = SIMDJSON_IMPLEMENTATION::builder::string_builder::DEFAULT_INITIAL_CAPACITY) {
+  return SIMDJSON_IMPLEMENTATION::builder::to_json(z, s, initial_capacity);
+}
 } // namespace simdjson
 
 #endif // SIMDJSON_STATIC_REFLECTION

include/simdjson/generic/ondemand/json_string_builder-inl.h

@@ -475,6 +475,12 @@ simdjson_inline void string_builder::escape_and_append_with_quotes(const char* i
   std::string_view cinput(input);
   escape_and_append_with_quotes(cinput);
 }
+#if SIMDJSON_SUPPORTS_CONCEPTS
+template<internal::fixed_string key>
+simdjson_inline void string_builder::escape_and_append_with_quotes()  noexcept {
+  escape_and_append_with_quotes(internal::string_constant<key>::value);
+}
+#endif
 
 simdjson_inline void string_builder::append_raw(const char *c) noexcept {
   size_t len = std::strlen(c);
@@ -654,6 +660,25 @@ simdjson_inline void string_builder::append_key_value(key_type key, value_type v
   }
 }
 
+#if SIMDJSON_SUPPORTS_CONCEPTS
+template<internal::fixed_string key, typename value_type>
+simdjson_inline void string_builder::append_key_value(value_type value) noexcept {
+  escape_and_append_with_quotes<key>();
+  append_colon();
+  SIMDJSON_IF_CONSTEXPR(std::is_same<value_type, std::nullptr_t>::value) {
+    append_null();
+  } else SIMDJSON_IF_CONSTEXPR(std::is_same<value_type, char>::value) {
+    escape_and_append_with_quotes(value);
+  } else SIMDJSON_IF_CONSTEXPR(std::is_convertible<value_type, std::string_view>::value) {
+    escape_and_append_with_quotes(value);
+  } else SIMDJSON_IF_CONSTEXPR(std::is_same<value_type, const char*>::value) {
+    escape_and_append_with_quotes(value);
+  } else {
+    append(value);
+  }
+}
+#endif
+
 } // namespace builder
 } // namespace SIMDJSON_IMPLEMENTATION
 } // namespace simdjson

include/simdjson/generic/ondemand/json_string_builder.h

@@ -12,7 +12,26 @@
 namespace simdjson {
 namespace SIMDJSON_IMPLEMENTATION {
 namespace builder {
+#if SIMDJSON_SUPPORTS_CONCEPTS
+// Helper to create string constants
+namespace internal {
+template <std::size_t N>
+struct fixed_string {
+    constexpr fixed_string(const char (&str)[N]) {
+        for (std::size_t i = 0; i < N; ++i) {
+            data[i] = str[i];
+        }
+    }
+    char data[N];
+    constexpr std::string_view view() const { return {data, N - 1}; }
+};
 
+template <fixed_string str>
+struct string_constant {
+    static constexpr std::string_view value = str.view();
+};
+} // namespace internal
+#endif // SIMDJSON_SUPPORTS_CONCEPTS
 /**
  * A builder for JSON strings representing documents. This is a low-level
  * builder that is not meant to be used directly by end-users. Though it
@@ -24,7 +43,9 @@ namespace builder {
  */
 class string_builder {
 public:
-  simdjson_inline string_builder(size_t initial_capacity = 1024);
+  simdjson_inline string_builder(size_t initial_capacity = DEFAULT_INITIAL_CAPACITY);
+
+  static constexpr size_t DEFAULT_INITIAL_CAPACITY = 1024;
 
   /**
    * Append number (includes Booleans). Booleans are mapped to the strings
@@ -62,7 +83,10 @@ public:
    * There is no UTF-8 validation.
    */
   simdjson_inline void escape_and_append_with_quotes(std::string_view input)  noexcept;
-
+#if SIMDJSON_SUPPORTS_CONCEPTS
+  template<internal::fixed_string key>
+  simdjson_inline void escape_and_append_with_quotes()  noexcept;
+#endif
   /**
    * Append the character surrounded by double quotes, after escaping it.
    * There is no UTF-8 validation.
@@ -116,9 +140,12 @@ public:
    * The key is escaped and surrounded by double quotes.
    * The value is escaped if it is a string.
    */
-   template<typename key_type, typename value_type>
+  template<typename key_type, typename value_type>
   simdjson_inline void append_key_value(key_type key, value_type value) noexcept;
 #if SIMDJSON_SUPPORTS_CONCEPTS
+  template<internal::fixed_string key, typename value_type>
+  simdjson_inline void append_key_value(value_type value) noexcept;
+
   // Support for optional types (std::optional, etc.)
   template <concepts::optional_type T>
   simdjson_inline void append(const T &opt);
@@ -232,7 +259,7 @@ private:
 #if !SIMDJSON_STATIC_REFLECTION
 // fallback implementation until we have static reflection
 template <class Z>
-simdjson_result<std::string> to_json(const Z &z, size_t initial_capacity = 1024) {
+simdjson_warn_unused simdjson_result<std::string> to_json(const Z &z, size_t initial_capacity = simdjson::SIMDJSON_IMPLEMENTATION::builder::string_builder::DEFAULT_INITIAL_CAPACITY) {
   simdjson::SIMDJSON_IMPLEMENTATION::builder::string_builder b(initial_capacity);
   b.append(z);
   std::string_view s;
@@ -240,6 +267,16 @@ simdjson_result<std::string> to_json(const Z &z, size_t initial_capacity = 1024)
   if(e) { return e; }
   return std::string(s);
 }
+template <class Z>
+simdjson_warn_unused simdjson_error to_json(const Z &z, std::string &s, size_t initial_capacity = simdjson::SIMDJSON_IMPLEMENTATION::builder::string_builder::DEFAULT_INITIAL_CAPACITY) {
+  simdjson::SIMDJSON_IMPLEMENTATION::builder::string_builder b(initial_capacity);
+  b.append(z);
+  std::string_view sv;
+  auto e = b.view().get(sv);
+  if(e) { return e; }
+  s.assign(sv.data(), sv.size());
+  return simdjson::SUCCESS;
+}
 #endif
 
 

include/simdjson/generic/ondemand/std_deserialize.h

@@ -291,7 +291,7 @@ error_code tag_invoke(deserialize_tag, ValT &val, T &out) noexcept {
     if constexpr (!std::meta::is_const(mem) && std::meta::is_public(mem)) {
       constexpr std::string_view key = std::define_static_string(std::meta::identifier_of(mem));
       // Note: removed static assert as optional types are now handled generically
-      // as long we are succesful or the field is not found, we continue
+      // as long we are successful or the field is not found, we continue
       if(e == simdjson::SUCCESS || e == simdjson::NO_SUCH_FIELD) {
         e = obj[key].get(out.[:mem:]);
       }

include/simdjson/simdjson_version.h

@@ -4,7 +4,7 @@
 #define SIMDJSON_SIMDJSON_VERSION_H
 
 /** The version of simdjson being used (major.minor.revision) */
-#define SIMDJSON_VERSION "4.0.3"
+#define SIMDJSON_VERSION "4.0.5"
 
 namespace simdjson {
 enum {
@@ -19,7 +19,7 @@ enum {
   /**
    * The revision (major.minor.REVISION) of simdjson being used.
    */
-  SIMDJSON_VERSION_REVISION = 3
+  SIMDJSON_VERSION_REVISION = 5
 };
 } // namespace simdjson
 

singleheader/simdjson.cpp

@@ -1,4 +1,4 @@
-/* auto-generated on 2025-09-15 19:47:29 -0600. version 4.0.3 Do not edit! */
+/* auto-generated on 2025-09-18 15:16:38 -0600. version 4.0.5 Do not edit! */
 /* including simdjson.cpp:  */
 /* begin file simdjson.cpp */
 #define SIMDJSON_SRC_SIMDJSON_CPP

tests/builder/builder_string_builder_tests.cpp

@@ -331,8 +331,6 @@ namespace builder_tests {
         TEST_SUCCEED();
     }
 
-
-
     void serialize_car(const Car& car, simdjson::builder::string_builder& builder) {
         // start of JSON
         builder.start_object();
@@ -369,7 +367,43 @@ namespace builder_tests {
         builder.end_object();
     }
 
+#if SIMDJSON_SUPPORTS_CONCEPTS
+    void serialize_car_template(const Car& car, simdjson::builder::string_builder& builder) {
+        // start of JSON
+        builder.start_object();
 
+        // "make"
+        builder.append_key_value<"make">(car.make);
+        builder.append_comma();
+
+        // "model"
+        builder.append_key_value<"model">(car.model);
+
+        builder.append_comma();
+
+        // "year"
+        builder.append_key_value<"year">(car.year);
+
+        builder.append_comma();
+
+        // "tire_pressure"
+        builder.escape_and_append_with_quotes<"tire_pressure">();
+        builder.append_colon();
+        builder.start_array();
+        // vector tire_pressure
+        for (size_t i = 0; i < car.tire_pressure.size(); ++i) {
+            builder.append(car.tire_pressure[i]);
+            if (i < car.tire_pressure.size() - 1) {
+                builder.append_comma();
+            }
+        }
+        // end of array
+        builder.end_array();
+
+        // end of object
+        builder.end_object();
+    }
+#endif
     bool car_test() {
         TEST_START();
         simdjson::builder::string_builder sb;
@@ -381,7 +415,18 @@ namespace builder_tests {
         ASSERT_EQUAL(p, "{\"make\":\"Toyota\",\"model\":\"Corolla\",\"year\":2017,\"tire_pressure\":[30.0,30.2,30.513,30.79]}");
         TEST_SUCCEED();
     }
-    #if SIMDJSON_SUPPORTS_CONCEPTS
+#if SIMDJSON_SUPPORTS_CONCEPTS
+    bool car_test_template() {
+        TEST_START();
+        simdjson::builder::string_builder sb;
+        Car c = {"Toyota", "Corolla", 2017, {30.0,30.2,30.513,30.79}};
+        serialize_car_template(c, sb);
+        std::string_view p;
+        auto result = sb.view().get(p);
+        ASSERT_SUCCESS(result);
+        ASSERT_EQUAL(p, "{\"make\":\"Toyota\",\"model\":\"Corolla\",\"year\":2017,\"tire_pressure\":[30.0,30.2,30.513,30.79]}");
+        TEST_SUCCEED();
+    }
     bool serialize_optional() {
         TEST_START();
         simdjson::builder::string_builder sb;
@@ -399,7 +444,7 @@ namespace builder_tests {
         ASSERT_EQUAL(p, "null");
         TEST_SUCCEED();
     }
-    #endif
+#endif
 
     #if SIMDJSON_SUPPORTS_RANGES && SIMDJSON_SUPPORTS_CONCEPTS
     void serialize_car_simple(const Car& car, simdjson::builder::string_builder& builder) {
@@ -474,6 +519,20 @@ namespace builder_tests {
         ASSERT_EQUAL(s, "[[1.0,2.0],[3.0,4.0]]");
         TEST_SUCCEED();
     }
+    bool double_double_test_to_string() {
+        TEST_START();
+        std::vector<std::vector<double>> c = {{1.0, 2.0}, {3.0, 4.0}};
+        simdjson::builder::string_builder sb;
+        sb.append(c);
+        std::string_view p;
+        auto result = sb.view().get(p);
+        ASSERT_SUCCESS(result);
+        ASSERT_EQUAL(p, "[[1.0,2.0],[3.0,4.0]]");
+        std::string s;
+        simdjson::simdjson_error ec = simdjson::to_json(c,s);
+        ASSERT_EQUAL(s, "[[1.0,2.0],[3.0,4.0]]");
+        TEST_SUCCEED();
+    }
     #if SIMDJSON_EXCEPTIONS
     bool car_test_simple_complete_exceptions() {
         TEST_START();
@@ -522,6 +581,7 @@ namespace builder_tests {
     #if SIMDJSON_SUPPORTS_RANGES && SIMDJSON_SUPPORTS_CONCEPTS
             map_test() &&
             double_double_test() &&
+            double_double_test_to_string() &&
             car_test_simple() &&
             car_test_simple_complete() &&
         #if SIMDJSON_EXCEPTIONS
@@ -529,7 +589,8 @@ namespace builder_tests {
         #endif
     #endif
     #if SIMDJSON_SUPPORTS_CONCEPTS
-           serialize_optional() &&
+            car_test_template() &&
+            serialize_optional() &&
     #endif
             append_char() &&
             append_integer() &&

tests/dom/CMakeLists.txt

@@ -123,7 +123,7 @@ endif()
 
 # Add the tests if we're on:
 #   1. Visual Studio 2022 v17.6 or later
-#   2. GCC v14.0.0 or later (GCC v13.0.0 cannot handle pipe oprator of lambda)
+#   2. GCC v14.0.0 or later (GCC v13.0.0 cannot handle pipe operator of lambda)
 #   3. Clang v15.0.0 or later (certain version C++ headers occur error when compiling)
 if(
   (MSVC AND MSVC_VERSION LESS 1930) OR

tests/ondemand/ondemand_convert_tests.cpp

@@ -62,57 +62,6 @@ struct complicated_weather_data {
 #ifdef __cpp_lib_ranges
 
 namespace convert_tests {
-#if SIMDJSON_EXCEPTIONS && SIMDJSON_SUPPORTS_CONCEPTS
-struct Car {
-  std::string make{};
-  std::string model{};
-  int year{};
-  std::vector<double> tire_pressure{};
-
-  friend simdjson::error_code tag_invoke(simdjson::deserialize_tag, auto &val,
-                                         Car &car) {
-    simdjson::ondemand::object obj;
-    auto error = val.get_object().get(obj);
-    if (error) {
-      return error;
-    }
-    // Instead of repeatedly obj["something"], we iterate through the object
-    // which we expect to be faster.
-    for (auto field : obj) {
-      simdjson::ondemand::raw_json_string key;
-      error = field.key().get(key);
-      if (error) {
-        return error;
-      }
-      if (key == "make") {
-        error = field.value().get_string(car.make);
-        if (error) {
-          return error;
-        }
-      } else if (key == "model") {
-        error = field.value().get_string(car.model);
-        if (error) {
-          return error;
-        }
-      } else if (key == "year") {
-        error = field.value().get(car.year);
-        if (error) {
-          return error;
-        }
-      } else if (key == "tire_pressure") {
-        error = field.value().get(car.tire_pressure);
-        if (error) {
-          return error;
-        }
-      }
-    }
-    return simdjson::SUCCESS;
-  }
-};
-
-static_assert(simdjson::custom_deserializable<std::unique_ptr<Car>>,
-              "It should be deserializable");
-
 
 simdjson::padded_string json_car =
     R"( {
@@ -130,15 +79,78 @@ simdjson::padded_string json_cars =
        "tire_pressure": [ 29.8, 30.0 ] }
 ])"_padded;
 
-bool simple() {
-  TEST_START();
-  Car car = simdjson::from(json_car);
-  if (car.make != "Toyota" || car.model != "Camry" || car.year != 2018) {
-    return false;
-  }
-  TEST_SUCCEED();
-}
+#if SIMDJSON_SUPPORTS_CONCEPTS
+  struct Car {
+    std::string make{};
+    std::string model{};
+    int year{};
+    std::vector<double> tire_pressure{};
 
+    friend simdjson::error_code tag_invoke(simdjson::deserialize_tag, auto &val,
+                                          Car &car) {
+      simdjson::ondemand::object obj;
+      auto error = val.get_object().get(obj);
+      if (error) {
+        return error;
+      }
+      // Instead of repeatedly obj["something"], we iterate through the object
+      // which we expect to be faster.
+      for (auto field : obj) {
+        simdjson::ondemand::raw_json_string key;
+        error = field.key().get(key);
+        if (error) {
+          return error;
+        }
+        if (key == "make") {
+          error = field.value().get_string(car.make);
+          if (error) {
+            return error;
+          }
+        } else if (key == "model") {
+          error = field.value().get_string(car.model);
+          if (error) {
+            return error;
+          }
+        } else if (key == "year") {
+          error = field.value().get(car.year);
+          if (error) {
+            return error;
+          }
+        } else if (key == "tire_pressure") {
+          error = field.value().get(car.tire_pressure);
+          if (error) {
+            return error;
+          }
+        }
+      }
+      return simdjson::SUCCESS;
+    }
+  };
+
+  static_assert(simdjson::custom_deserializable<std::unique_ptr<Car>>,
+                "It should be deserializable");
+
+
+  bool simple_no_except() {
+    TEST_START();
+    Car car;
+    ASSERT_SUCCESS(simdjson::from(json_car).get(car));
+    if (car.make != "Toyota" || car.model != "Camry" || car.year != 2018) {
+      return false;
+    }
+    TEST_SUCCEED();
+  }
+#endif // SIMDJSON_SUPPORTS_CONCEPTS
+#if SIMDJSON_EXCEPTIONS && SIMDJSON_SUPPORTS_CONCEPTS
+
+  bool simple() {
+    TEST_START();
+    Car car = simdjson::from(json_car);
+    if (car.make != "Toyota" || car.model != "Camry" || car.year != 2018) {
+      return false;
+    }
+    TEST_SUCCEED();
+  }
 
   struct BadPlayer {
       int username;  // Oops, should be string!
@@ -468,6 +480,9 @@ bool run() {
 #if SIMDJSON_STATIC_REFLECTION
       meeting_time_test() && meeting_test() && bad_player() && good_player() && complicated_weather_test() &&
 #endif
+#if SIMDJSON_SUPPORTS_CONCEPTS
+      simple_no_except() &&
+#endif
 #if SIMDJSON_EXCEPTIONS && SIMDJSON_SUPPORTS_CONCEPTS
       broken() && simple() && simple_optional() && with_parser() && to_array() &&
       to_bad_array() &&