mirror of
https://github.com/nlohmann/json.git
synced 2025-04-19 13:02:16 +03:00
d3e347bd2d
* mkdocs: add string_view examples * mkdocs: reference underlying operators * mkdocs: add operator<=> examples * mkdocs: fix style check issues * mkdocs: tweak BJData page * mkdocs: add CMake option hints to macros * mkdocs: fix JSON_DISABLE_ENUM_SERIALIZATION definition * mkdocs: fix link to unit-udt.cpp * mkdocs: fix "Arbitrary Type Conversions" title * mkdocs: link to api/macros/*.md instead of features/macros.md * mkdocs: document JSON_DisableEnumSerialization CMake option * mkdocs: encode required C++ standard in example files * docset: detect gsed/sed * docset: update index * docset: fix CSS patching * docset: add list_missing_pages make target * docset: add list_removed_paths make target * docset: replace page titles with name from index * docset: add install target for Zeal docset browser * Use GCC_TOOL in ci_test_documentation target
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
#include <iostream>
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using json = nlohmann::json;
|
|
|
|
int main()
|
|
{
|
|
// create a JSON value
|
|
const json j =
|
|
{
|
|
{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
|
|
};
|
|
|
|
// read-only access
|
|
|
|
// output element with JSON pointer "/number"
|
|
std::cout << j.at("/number"_json_pointer) << '\n';
|
|
// output element with JSON pointer "/string"
|
|
std::cout << j.at("/string"_json_pointer) << '\n';
|
|
// output element with JSON pointer "/array"
|
|
std::cout << j.at("/array"_json_pointer) << '\n';
|
|
// output element with JSON pointer "/array/1"
|
|
std::cout << j.at("/array/1"_json_pointer) << '\n';
|
|
|
|
// out_of_range.109
|
|
try
|
|
{
|
|
// try to use an array index that is not a number
|
|
json::const_reference ref = j.at("/array/one"_json_pointer);
|
|
}
|
|
catch (json::parse_error& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
|
|
// out_of_range.401
|
|
try
|
|
{
|
|
// try to use an invalid array index
|
|
json::const_reference ref = j.at("/array/4"_json_pointer);
|
|
}
|
|
catch (json::out_of_range& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
|
|
// out_of_range.402
|
|
try
|
|
{
|
|
// try to use the array index '-'
|
|
json::const_reference ref = j.at("/array/-"_json_pointer);
|
|
}
|
|
catch (json::out_of_range& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
|
|
// out_of_range.403
|
|
try
|
|
{
|
|
// try to use a JSON pointer to a nonexistent object key
|
|
json::const_reference ref = j.at("/foo"_json_pointer);
|
|
}
|
|
catch (json::out_of_range& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
|
|
// out_of_range.404
|
|
try
|
|
{
|
|
// try to use a JSON pointer that cannot be resolved
|
|
json::const_reference ref = j.at("/number/foo"_json_pointer);
|
|
}
|
|
catch (json::out_of_range& e)
|
|
{
|
|
std::cout << e.what() << '\n';
|
|
}
|
|
}
|