style: clang-tidy: modernize-use-emplace

.clang-tidy

@@ -8,6 +8,7 @@ readability-container-size-empty,
 modernize-use-using,
 modernize-use-equals-default,
 modernize-use-auto,
+modernize-use-emplace,
 '
 
 HeaderFilterRegex: 'pybind11/.*h'

include/pybind11/pybind11.h

@@ -543,7 +543,7 @@ protected:
                         self_value_and_holder.type->dealloc(self_value_and_holder);
 
                     call.init_self = PyTuple_GET_ITEM(args_in, 0);
-                    call.args.push_back(reinterpret_cast<PyObject *>(&self_value_and_holder));
+                    call.args.emplace_back(reinterpret_cast<PyObject *>(&self_value_and_holder));
                     call.args_convert.push_back(false);
                     ++args_copied;
                 }

tests/pybind11_tests.cpp

@@ -32,11 +32,11 @@ std::list<std::function<void(py::module &)>> &initializers() {
 }
 
 test_initializer::test_initializer(Initializer init) {
-    initializers().push_back(init);
+    initializers().emplace_back(init);
 }
 
 test_initializer::test_initializer(const char *submodule_name, Initializer init) {
-    initializers().push_back([=](py::module &parent) {
+    initializers().emplace_back([=](py::module &parent) {
         auto m = parent.def_submodule(submodule_name);
         init(m);
     });