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+---
+Title: 'emplace()'
+Description: 'Inserts a new element into an unordered_set by constructing it in place.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Containers'
+  - 'Methods'
+  - 'Sets'
+  - 'STL'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+The **`emplace()`** method inserts a new element into an `unordered_set` by constructing it directly within the container. Unlike `insert()`, which requires a fully constructed object, `emplace()` forwards constructor arguments and builds the element in place, avoiding unnecessary copies or moves.
+
+If an equivalent element already exists in the set, no insertion occurs.
+
+## Syntax
+
+```pseudo
+unordered_set_name.emplace(element)
+```
+
+**Parameters:**
+
+- `element`: The value to be inserted into the `unordered_set`.
+
+**Return value:**
+
+Returns a `std::pair<iterator, bool>`:
+
+- `iterator`: Points to the inserted element or the existing equivalent element.
+- `bool`:
+  - `true` if insertion took place
+  - `false` if the element already existed
+
+## Example 1: Basic Insertion
+
+This example shows how `emplace()` inserts elements into an `unordered_set`:
+
+```cpp
+#include <iostream>
+#include <unordered_set>
+
+int main() {
+  std::unordered_set<int> numbers;
+
+  auto result = numbers.emplace(10);
+
+  std::cout << "Inserted: " << std::boolalpha << result.second << "\n";
+  std::cout << "Value: " << *result.first << "\n";
+
+  return 0;
+}
+```
+
+The output of this code is:
+
+```shell
+Inserted: true
+Value: 10
+```
+
+## Example 2: Preventing Duplicate Elements
+
+This example demonstrates that `emplace()` does not insert duplicate values:
+
+```cpp
+#include <iostream>
+#include <unordered_set>
+
+int main() {
+  std::unordered_set<int> values = {1, 2, 3};
+
+  auto first = values.emplace(2);
+  auto second = values.emplace(4);
+
+  std::cout << "Insert 2 successful? " << first.second << "\n";
+  std::cout << "Insert 4 successful? " << second.second << "\n";
+
+  return 0;
+}
+```
+
+The output of this code is:
+
+```shell
+Insert 2 successful? 0
+Insert 4 successful? 1
+```
+
+Since 2 already exists in the set, it is not inserted again.
+
+## Codebyte Example: In-Place Construction of Objects
+
+This example highlights the main advantage of `emplace()` by constructing objects directly inside the container:
+
+```codebyte/cpp
+#include <iostream>
+#include <unordered_set>
+#include <string>
+
+int main() {
+  std::unordered_set<std::string> words;
+
+  words.emplace(5, 'a');  // Constructs "aaaaa" in place
+  words.emplace("hello");
+
+  for (const auto& word : words) {
+    std::cout << word << "\n";
+  }
+
+  return 0;
+}
+```
+
+Here, the string `"aaaaa"` is constructed directly inside the `unordered_set` using the `std::string(size, char)` constructor.
+
+## Frequently Asked Questions
+
+### 1. What does `emplace()` do in `unordered_set`?
+
+`emplace()` inserts a new element into an `unordered_set` by constructing it directly inside the container, avoiding unnecessary copies or moves.
+
+### 2. What is the difference between `insert()` and `emplace()` in `unordered_set`?
+
+`insert()` adds an already constructed object to the set, while `emplace()` constructs the object in place using constructor arguments, which can be more efficient.