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Added as<std::string_view>() and is<std::string_view>()

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Benoit Blanchon
2021-07-27 14:15:05 +02:00
parent 6632fa8da1
commit 9d58e566fd
3 changed files with 29 additions and 0 deletions
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1
CHANGELOG.md
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@@ -5,6 +5,7 @@ HEAD
---- ----
* Changed return type of `convertToJson()` and `Converter<T>::toJson()` to `void` * Changed return type of `convertToJson()` and `Converter<T>::toJson()` to `void`
* Added `as<std::string_view>()` and `is<std::string_view>()`
v6.18.2 (2021-07-19) v6.18.2 (2021-07-19)
------- -------

14
extras/tests/Cpp17/string_view.cpp
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@@ -58,6 +58,20 @@ TEST_CASE("string_view") {
doc.add(std::string_view("example two", 7)); doc.add(std::string_view("example two", 7));
REQUIRE(doc.memoryUsage() == JSON_ARRAY_SIZE(2) + 8); REQUIRE(doc.memoryUsage() == JSON_ARRAY_SIZE(2) + 8);
} }
SECTION("as<std::string_view>()") {
doc["s"] = "Hello World";
doc["i"] = 42;
REQUIRE(doc["s"].as<std::string_view>() == std::string_view("Hello World"));
REQUIRE(doc["i"].as<std::string_view>() == std::string_view());
}
SECTION("is<std::string_view>()") {
doc["s"] = "Hello World";
doc["i"] = 42;
REQUIRE(doc["s"].is<std::string_view>() == true);
REQUIRE(doc["i"].is<std::string_view>() == false);
}
} }
using ARDUINOJSON_NAMESPACE::adaptString; using ARDUINOJSON_NAMESPACE::adaptString;

14
src/ArduinoJson/Variant/ConverterImpl.hpp
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@@ -256,4 +256,18 @@ inline void convertToJson(const ::Printable& src, VariantRef dst) {
#endif #endif
#if ARDUINOJSON_ENABLE_STRING_VIEW
inline void convertFromJson(VariantConstRef src, std::string_view& dst) {
const char* str = src.as<const char*>();
if (str) // the standard doesn't allow passing null to the constructor
dst = std::string_view(str);
}
inline bool canConvertFromJson(VariantConstRef src, const std::string_view&) {
return src.is<const char*>();
}
#endif
} // namespace ARDUINOJSON_NAMESPACE } // namespace ARDUINOJSON_NAMESPACE