[Support] json::Value construction from std::vector<T> and std::map<s…

…tring,T>.

Summary: Previously this required a conversion to json::Array/json::Object first.

Reviewers: ioeric

Subscribers: kristina, llvm-commits

Differential Revision: https://reviews.llvm.org/D53385

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344732 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/JSON.h

@@ -294,9 +294,13 @@ class Value {
   Value(json::Array &&Elements) : Type(T_Array) {
     create<json::Array>(std::move(Elements));
   }
+  template <typename Elt>
+  Value(const std::vector<Elt> &C) : Value(json::Array(C)) {}
   Value(json::Object &&Properties) : Type(T_Object) {
     create<json::Object>(std::move(Properties));
   }
+  template <typename Elt>
+  Value(const std::map<std::string, Elt> &C) : Value(json::Object(C)) {}
   // Strings: types with value semantics. Must be valid UTF-8.
   Value(std::string V) : Type(T_String) {
     if (LLVM_UNLIKELY(!isUTF8(V))) {

unittests/Support/JSONTest.cpp

@@ -47,6 +47,8 @@ TEST(JSONTest, Constructors) {
             s(Object{{"A", Object{{"B", Object{{"X", "Y"}}}}}}));
   EXPECT_EQ("null", s(llvm::Optional<double>()));
   EXPECT_EQ("2.5", s(llvm::Optional<double>(2.5)));
+  EXPECT_EQ("[[2.5,null]]", s(std::vector<std::vector<llvm::Optional<double>>>{
+                                 {2.5, llvm::None}}));
 }
 
 TEST(JSONTest, StringOwnership) {