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nlohmann
2026-10-26 21:24:35 +00:00
parent 41c601a7d1
commit d2e264bd84
1400 changed files with 11859 additions and 5440 deletions
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api/basic_json/value.md
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@@ -45,6 +45,9 @@ This is equivalent to Python's `dict.get(key, default)`.
return default_value;
}
```
with one exception: if the JSON value is neither an array nor an object, the function throws
[`type_error.306`](../../home/exceptions.md#jsonexceptiontype_error306) before looking at `ptr`, even for the empty
pointer, whereas `at` returns the value itself for the empty pointer.
!!! note "Differences to `at` and `operator[]`"
@@ -143,7 +146,7 @@ changes to any JSON value.
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
int main()
{
@@ -151,7 +154,7 @@ changes to any JSON value.
std::cout << "operator[]: " << j["uint64"] << '\n'
<< "default value (int): " << j.value("uint64", 0) << '\n'
<< "default value (uint64_t): " << j.value("uint64", std::uint64_t(0)) << '\n'
<< "default value (uint64_t): " << j.value("uint64", static_cast<std::uint64_t>(0)) << '\n'
<< "explicit return value type: " << j.value<std::uint64_t>("uint64", 0) << '\n';
}
@@ -189,7 +192,7 @@ changes to any JSON value.
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
int main()
{
@@ -236,7 +239,7 @@ changes to any JSON value.
#include <nlohmann/json.hpp>
using namespace std::string_view_literals;
using json = nlohmann::json;
using nlohmann::json;
int main()
{
@@ -281,7 +284,7 @@ changes to any JSON value.
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
using namespace nlohmann::literals;
int main()
@@ -328,7 +331,7 @@ changes to any JSON value.
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using nlohmann::json;
int main()
{