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nlohmann committed 2026-10-26 21:24:35 +00:00
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api/macros/nlohmann_json_serialize_enum_strict.md
+16 -10
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@@ -48,6 +48,12 @@ inline void from_json(const BasicJsonType& j, type& e);
Define [`JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS`](json_use_objects_for_enum_keyed_maps.md) to store them as objects
with the converted keys. Such maps can be read from both forms.
!!! info "Views"
The generated `from_json()` also reads the views of [`json_document`](../json_document.md)s
(`<nlohmann/json_view.hpp>`), comparing the view with the entries of the mapping, without building a `json` value
first.
## Examples
??? example "Example: Basic usage"
@@ -59,7 +65,7 @@ inline void from_json(const BasicJsonType& j, type& e);
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
namespace ns
{
@@ -97,7 +103,7 @@ inline void from_json(const BasicJsonType& j, type& e);
json j_stopped = ns::TS_STOPPED;
json j_red = ns::Color::red;
std::cout << "ns::TS_STOPPED -> " << j_stopped
<< ", ns::Color::red -> " << j_red << std::endl;
<< ", ns::Color::red -> " << j_red << '\n';
// deserialization
json j_running = "running";
@@ -105,7 +111,7 @@ inline void from_json(const BasicJsonType& j, type& e);
auto running = j_running.get<ns::TaskState>();
auto blue = j_blue.get<ns::Color>();
std::cout << j_running << " -> " << running
<< ", " << j_blue << " -> " << static_cast<int>(blue) << std::endl;
<< ", " << j_blue << " -> " << static_cast<int>(blue) << '\n';
}
@@ -129,7 +135,7 @@ inline void from_json(const BasicJsonType& j, type& e);
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
namespace ns
{
@@ -150,14 +156,14 @@ inline void from_json(const BasicJsonType& j, type& e);
{
// serialization
json j_red = ns::Color::red;
std::cout << static_cast<int>(ns::Color::red) << " -> " << j_red << std::endl;
std::cout << static_cast<int>(ns::Color::red) << " -> " << j_red << '\n';
// deserialization
json j_rot = "rot";
auto rot = j_rot.get<ns::Color>();
auto red = j_red.get<ns::Color>();
std::cout << j_rot << " -> " << static_cast<int>(rot) << std::endl;
std::cout << j_red << " -> " << static_cast<int>(red) << std::endl;
std::cout << j_rot << " -> " << static_cast<int>(rot) << '\n';
std::cout << j_red << " -> " << static_cast<int>(red) << '\n';
}
```
@@ -182,7 +188,7 @@ inline void from_json(const BasicJsonType& j, type& e);
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
namespace ns
{
@@ -215,7 +221,7 @@ inline void from_json(const BasicJsonType& j, type& e);
}
catch (const json::exception e)
{
std::cout << "deserialization failed: " << e.what() << std::endl;
std::cout << "deserialization failed: " << e.what() << '\n';
}
// invalid deserialization
@@ -227,7 +233,7 @@ inline void from_json(const BasicJsonType& j, type& e);
}
catch (const json::exception e)
{
std::cout << "deserialization failed: " << e.what() << std::endl;
std::cout << "deserialization failed: " << e.what() << '\n';
}
return 0;