[core] Fix google-explicit-constructor errors

As reported by clang-tidy-8.

4 files changed, 4 insertions, 10 deletions

diff --git a/platform/default/src/mbgl/storage/local_file_source.cpp b/platform/default/src/mbgl/storage/local_file_source.cpp
index b505303fc0..5d92e711a1 100644
--- a/platform/default/src/mbgl/storage/local_file_source.cpp
+++ b/platform/default/src/mbgl/storage/local_file_source.cpp
@@ -19,7 +19,7 @@ namespace mbgl {
 
 class LocalFileSource::Impl {
 public:
-    Impl(const ActorRef<Impl>&) {}
+    explicit Impl(const ActorRef<Impl>&) {}
 
     void request(const std::string& url, const ActorRef<FileSourceRequest>& req) {
         if (!acceptsURL(url)) {
diff --git a/platform/default/src/mbgl/storage/sqlite3.cpp b/platform/default/src/mbgl/storage/sqlite3.cpp
index 69d03c4e00..03c1c2e44d 100644
--- a/platform/default/src/mbgl/storage/sqlite3.cpp
+++ b/platform/default/src/mbgl/storage/sqlite3.cpp
@@ -46,9 +46,7 @@ void setTempPath(const std::string& path) {
 
 class DatabaseImpl {
 public:
-    DatabaseImpl(sqlite3* db_)
-        : db(db_)
-    {
+    explicit DatabaseImpl(sqlite3* db_) : db(db_) {
         const int error = sqlite3_extended_result_codes(db, true);
         if (error != SQLITE_OK) {
             mbgl::Log::Warning(mbgl::Event::Database, error, "Failed to enable extended result codes: %s", sqlite3_errmsg(db));
diff --git a/platform/default/src/mbgl/util/async_task.cpp b/platform/default/src/mbgl/util/async_task.cpp
index 50891056d8..d82b8085a1 100644
--- a/platform/default/src/mbgl/util/async_task.cpp
+++ b/platform/default/src/mbgl/util/async_task.cpp
@@ -12,10 +12,7 @@ namespace util {
 
 class AsyncTask::Impl {
 public:
-    Impl(std::function<void()>&& fn)
-        : async(new uv_async_t),
-          task(std::move(fn)) {
-
+    explicit Impl(std::function<void()> fn) : async(new uv_async_t), task(std::move(fn)) {
         auto* loop = reinterpret_cast<uv_loop_t*>(RunLoop::getLoopHandle());
         if (uv_async_init(loop, async, asyncCallback) != 0) {
             throw std::runtime_error("Failed to initialize async.");
diff --git a/platform/default/src/mbgl/util/jpeg_reader.cpp b/platform/default/src/mbgl/util/jpeg_reader.cpp
index 69df494e70..8daa02f076 100644
--- a/platform/default/src/mbgl/util/jpeg_reader.cpp
+++ b/platform/default/src/mbgl/util/jpeg_reader.cpp
@@ -79,8 +79,7 @@ static void on_error_message(j_common_ptr cinfo) {
 }
 
 struct jpeg_info_guard {
-    jpeg_info_guard(jpeg_decompress_struct* cinfo)
-        : i_(cinfo) {}
+    explicit jpeg_info_guard(jpeg_decompress_struct* cinfo) : i_(cinfo) {}
 
     ~jpeg_info_guard() {
         jpeg_destroy_decompress(i_);