Implement and use make_unique

Allows avoiding some explicit calls to new(), which can look suspicious

src/builtin_string.cpp

@@ -572,9 +572,9 @@ static int string_match(parser_t &parser, io_streams_t &streams, int argc, wchar
 
     std::unique_ptr<string_matcher_t> matcher;
     if (regex) {
-        matcher.reset(new pcre2_matcher_t(argv[0], pattern, opts, streams));
+        matcher = make_unique<pcre2_matcher_t>(argv[0], pattern, opts, streams);
     } else {
-        matcher.reset(new wildcard_matcher_t(argv[0], pattern, opts, streams));
+        matcher = make_unique<wildcard_matcher_t>(argv[0], pattern, opts, streams);
     }
 
     const wchar_t *arg;

src/common.h

@@ -644,6 +644,12 @@ wcstring vformat_string(const wchar_t *format, va_list va_orig);
 void append_format(wcstring &str, const wchar_t *format, ...);
 void append_formatv(wcstring &str, const wchar_t *format, va_list ap);
 
+/// make_unique implementation
+template<typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args&&... args) {
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
 /// This functions returns the end of the quoted substring beginning at \c in. The type of quoting
 /// character is detemrined by examining \c in. Returns 0 on error.
 ///

src/parser.cpp

@@ -573,7 +573,7 @@ job_t *parser_t::job_get_from_pid(int pid) {
 profile_item_t *parser_t::create_profile_item() {
     profile_item_t *result = nullptr;
     if (g_profiling_active) {
-        profile_items.emplace_back(new profile_item_t());
+        profile_items.push_back(make_unique<profile_item_t>());
         result = profile_items.back().get();
     }
     return result;
@@ -612,8 +612,7 @@ int parser_t::eval_acquiring_tree(const wcstring &cmd, const io_chain_t &io,
         (execution_contexts.empty() ? -1 : execution_contexts.back()->current_eval_level());
 
     // Append to the execution context stack.
-    // Note usage of unique_ptr, so we don't have to delete
-    execution_contexts.emplace_back(new parse_execution_context_t(tree, cmd, this, exec_eval_level));
+    execution_contexts.push_back(make_unique<parse_execution_context_t>(tree, cmd, this, exec_eval_level));
     const parse_execution_context_t *ctx = execution_contexts.back().get();
 
     // Execute the first node.