Add to_json() for std::vector<bool>::reference

nlohmann · Jun 13, 2022 · 475d132 · 475d132
1 parent af34396
commit 475d132
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Showing 3 changed files with 21 additions and 0 deletions.
diff --git a/include/nlohmann/detail/conversions/to_json.hpp b/include/nlohmann/detail/conversions/to_json.hpp
@@ -272,6 +272,13 @@ inline void to_json(BasicJsonType& j, T b) noexcept
  external_constructor<value_t::boolean>::construct(j, b);
 }
 
+template<typename BasicJsonType,
+ enable_if_t<std::is_convertible<const std::vector<bool>::reference&, typename BasicJsonType::boolean_t>::value, int> = 0>
+inline void to_json(BasicJsonType& j, const std::vector<bool>::reference& b) noexcept
+{
+ external_constructor<value_t::boolean>::construct(j, static_cast<typename BasicJsonType::boolean_t>(b));
+}
+
 template<typename BasicJsonType, typename CompatibleString,
  enable_if_t<std::is_constructible<typename BasicJsonType::string_t, CompatibleString>::value, int> = 0>
 inline void to_json(BasicJsonType& j, const CompatibleString& s)

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
@@ -5253,6 +5253,13 @@ inline void to_json(BasicJsonType& j, T b) noexcept
  external_constructor<value_t::boolean>::construct(j, b);
 }
 
+template<typename BasicJsonType,
+ enable_if_t<std::is_convertible<const std::vector<bool>::reference&, typename BasicJsonType::boolean_t>::value, int> = 0>
+inline void to_json(BasicJsonType& j, const std::vector<bool>::reference& b) noexcept
+{
+ external_constructor<value_t::boolean>::construct(j, static_cast<typename BasicJsonType::boolean_t>(b));
+}
+
 template<typename BasicJsonType, typename CompatibleString,
  enable_if_t<std::is_constructible<typename BasicJsonType::string_t, CompatibleString>::value, int> = 0>
 inline void to_json(BasicJsonType& j, const CompatibleString& s)

diff --git a/tests/src/unit-constructor1.cpp b/tests/src/unit-constructor1.cpp
@@ -474,6 +474,13 @@ TEST_CASE("constructors")
  json j(false);
  CHECK(j.type() == json::value_t::boolean);
  }
+
+ SECTION("from std::vector<bool>::refrence")
+ {
+ std::vector<bool> v{true};
+ json j(v[0]);
+ CHECK(j.type() == json::value_t::boolean);
+ }
  }
 
  SECTION("create a binary (explicit)")