108         return *this;
113         iterator it = this->find(key);  in at()
115         if (it == this->end()) {  in at()
122         return const_cast<concurrent_map*>(this)->at(key);  in at()
126         iterator it = this->find(key);
128         if (it == this->end()) {
129 …    it = this->emplace(std::piecewise_construct, std::forward_as_tuple(key), std::tuple<>()).first;
135         iterator it = this->find(key);
137         if (it == this->end()) {
138 …it = this->emplace(std::piecewise_construct, std::forward_as_tuple(std::move(key)), std::tuple<>()…
149         return this->emplace(std::forward<P>(value));  in insert()
156         return this->emplace_hint(hint, std::forward<P>(value));  in insert()
161         this->internal_merge(source);  in merge()
166         this->internal_merge(std::move(source));  in merge()
171         this->internal_merge(source);  in merge()
176         this->internal_merge(std::move(source));  in merge()
259         return *this;
266         return this->emplace(std::forward<P>(value));  in insert()
273         return this->emplace_hint(hint, std::forward<P>(value));  in insert()
278         this->internal_merge(source);  in merge()
283         this->internal_merge(std::move(source));  in merge()
288         this->internal_merge(source);  in merge()
293         this->internal_merge(std::move(source));  in merge()