[core] Fix google-explicit-constructor errors

As reported by clang-tidy-8.

3 files changed, 3 insertions, 4 deletions

diff --git a/src/mbgl/annotation/annotation_tile.cpp b/src/mbgl/annotation/annotation_tile.cpp
index 69c9f07655..c74fcfd4a9 100644
--- a/src/mbgl/annotation/annotation_tile.cpp
+++ b/src/mbgl/annotation/annotation_tile.cpp
@@ -70,8 +70,7 @@ const GeometryCollection& AnnotationTileFeature::getGeometries() const {
 
 class AnnotationTileLayerData {
 public:
-    AnnotationTileLayerData(std::string name_) : name(std::move(name_)) {
-    }
+    explicit AnnotationTileLayerData(std::string name_) : name(std::move(name_)) {}
 
     const std::string name;
     std::vector<std::shared_ptr<const AnnotationTileFeatureData>> features;
diff --git a/src/mbgl/style/expression/compound_expression.cpp b/src/mbgl/style/expression/compound_expression.cpp
index 31628617f6..b95dabfc84 100644
--- a/src/mbgl/style/expression/compound_expression.cpp
+++ b/src/mbgl/style/expression/compound_expression.cpp
@@ -33,7 +33,7 @@ bool operator==(const VarargsType& lhs, const VarargsType& rhs) {
 template <typename T>
 struct Varargs : std::vector<T> {
     template <class... Args>
-    Varargs(Args&&... args) : std::vector<T>(std::forward<Args>(args)...) {}
+    explicit Varargs(Args&&... args) : std::vector<T>(std::forward<Args>(args)...) {}
 };
 
 namespace detail {
diff --git a/src/mbgl/style/expression/expression.cpp b/src/mbgl/style/expression/expression.cpp
index 4f5e3848d5..270fa5eba0 100644
--- a/src/mbgl/style/expression/expression.cpp
+++ b/src/mbgl/style/expression/expression.cpp
@@ -12,7 +12,7 @@ public:
     const Feature& feature;
     mutable optional<GeometryCollection> geometry;
 
-    GeoJSONFeature(const Feature& feature_) : feature(feature_) {}
+    explicit GeoJSONFeature(const Feature& feature_) : feature(feature_) {}
     GeoJSONFeature(const Feature& feature_, const CanonicalTileID& canonical) : feature(feature_) {
         geometry = convertGeometry(feature.geometry, canonical);
         // https://github.com/mapbox/geojson-vt-cpp/issues/44