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Change link() to shallowCopy() (issue #1343)

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Instead of storing a pointer, the function copies the `VariantData`.

Benefits:
* smaller code
* no impact on programs that don't use this feature

Drawbacks:
* changes to the original variant are not always reflected on the copy
* modifying the original from the shallow copy leads to UB
This commit is contained in:
Benoit Blanchon
2022-07-05 17:07:43 +02:00
parent 3b3ab8c4e1
commit cd8373ad32
36 changed files with 78 additions and 543 deletions
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110
extras/tests/JsonVariant/is.cpp
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@ -144,24 +144,6 @@ TEST_CASE("JsonVariant::is<T>()") {
CHECK(variant.is<MYENUM2>() == false);
}
SECTION("linked array") {
StaticJsonDocument<1024> doc2;
doc2[0] = "world";
variant.link(doc2);
CHECK(variant.is<JsonArray>() == false);
CHECK(variant.is<JsonArrayConst>() == true);
CHECK(variant.is<JsonVariant>() == true);
CHECK(variant.is<JsonVariantConst>() == true);
CHECK(variant.is<JsonObject>() == false);
CHECK(variant.is<JsonObjectConst>() == false);
CHECK(variant.is<int>() == false);
CHECK(variant.is<float>() == false);
CHECK(variant.is<bool>() == false);
CHECK(variant.is<const char *>() == false);
CHECK(variant.is<MYENUM2>() == false);
}
SECTION("JsonObject") {
variant.to<JsonObject>();
@ -179,44 +161,6 @@ TEST_CASE("JsonVariant::is<T>()") {
CHECK(variant.is<JsonVariant>() == true);
CHECK(variant.is<JsonVariantConst>() == true);
}
SECTION("linked object") {
StaticJsonDocument<1024> doc2;
doc2["hello"] = "world";
variant.link(doc2);
CHECK(variant.is<JsonObject>() == false);
CHECK(variant.is<JsonObjectConst>() == true);
CHECK(variant.is<JsonVariant>() == true);
CHECK(variant.is<JsonVariantConst>() == true);
CHECK(variant.is<JsonArray>() == false);
CHECK(variant.is<JsonArrayConst>() == false);
CHECK(variant.is<int>() == false);
CHECK(variant.is<float>() == false);
CHECK(variant.is<bool>() == false);
CHECK(variant.is<const char *>() == false);
CHECK(variant.is<MYENUM2>() == false);
CHECK(variant.is<JsonVariant>() == true);
CHECK(variant.is<JsonVariantConst>() == true);
}
SECTION("linked int") {
StaticJsonDocument<1024> doc2;
doc2.set(42);
variant.link(doc2);
CHECK(variant.is<JsonObjectConst>() == false);
CHECK(variant.is<JsonVariantConst>() == true);
CHECK(variant.is<JsonObject>() == false);
CHECK(variant.is<JsonVariant>() == true);
CHECK(variant.is<JsonArray>() == false);
CHECK(variant.is<JsonArrayConst>() == false);
CHECK(variant.is<int>() == true);
CHECK(variant.is<float>() == true);
CHECK(variant.is<bool>() == false);
CHECK(variant.is<const char *>() == false);
CHECK(variant.is<MYENUM2>() == true);
}
}
TEST_CASE("JsonVariantConst::is<T>()") {
@ -372,58 +316,4 @@ TEST_CASE("JsonVariantConst::is<T>()") {
CHECK(cvariant.is<const char *>() == false);
CHECK(cvariant.is<MYENUM2>() == false);
}
SECTION("linked array") {
StaticJsonDocument<1024> doc2;
doc2[0] = "world";
variant.link(doc2);
CHECK(cvariant.is<JsonArrayConst>() == true);
CHECK(cvariant.is<JsonVariantConst>() == true);
CHECK(cvariant.is<JsonArray>() == false);
CHECK(cvariant.is<JsonVariant>() == false);
CHECK(cvariant.is<JsonObject>() == false);
CHECK(cvariant.is<JsonObjectConst>() == false);
CHECK(cvariant.is<int>() == false);
CHECK(cvariant.is<float>() == false);
CHECK(cvariant.is<bool>() == false);
CHECK(cvariant.is<const char *>() == false);
CHECK(cvariant.is<MYENUM2>() == false);
}
SECTION("linked object") {
StaticJsonDocument<1024> doc2;
doc2["hello"] = "world";
variant.link(doc2);
CHECK(cvariant.is<JsonObjectConst>() == true);
CHECK(cvariant.is<JsonVariantConst>() == true);
CHECK(cvariant.is<JsonObject>() == false);
CHECK(cvariant.is<JsonVariant>() == false);
CHECK(cvariant.is<JsonArray>() == false);
CHECK(cvariant.is<JsonArrayConst>() == false);
CHECK(cvariant.is<int>() == false);
CHECK(cvariant.is<float>() == false);
CHECK(cvariant.is<bool>() == false);
CHECK(cvariant.is<const char *>() == false);
CHECK(cvariant.is<MYENUM2>() == false);
}
SECTION("linked int") {
StaticJsonDocument<1024> doc2;
doc2.set(42);
variant.link(doc2);
CHECK(cvariant.is<JsonObjectConst>() == false);
CHECK(cvariant.is<JsonVariantConst>() == true);
CHECK(cvariant.is<JsonObject>() == false);
CHECK(cvariant.is<JsonVariant>() == false);
CHECK(cvariant.is<JsonArray>() == false);
CHECK(cvariant.is<JsonArrayConst>() == false);
CHECK(cvariant.is<int>() == true);
CHECK(cvariant.is<float>() == true);
CHECK(cvariant.is<bool>() == false);
CHECK(cvariant.is<const char *>() == false);
CHECK(cvariant.is<MYENUM2>() == true);
}
}