C++ Interactive REPL Playground

Script Editor

Interactive REPL

// No active state loaded. Run statements in REPL to build compilation state.

Vector Operations

Standard STL vector declaration, initialization, sorting, and printing.

Lambda Expressions

Defining custom anonymous inline functions inside the REPL context.

Smart Pointers

Using memory management with std::unique_ptr and std::shared_ptr.

Structured Bindings

C++17 structured bindings to unpack pairs, tuples, or structs easily.

How to use the C++ REPL

Local Statements: Type commands (like int x = 42; or cout << x * 2 << endl;) directly in the terminal and hit Enter to run.
Variable Preservation: Variables declared in previous commands (e.g. string name = "Antigravity";) are fully accessible in subsequent commands.
Global Declarations: You can define helper functions and structs (e.g. struct User { string name; int age; };). They are compiled in the global namespace.
Header Includes: Type #include <set> to dynamically load new library headers into your session.
Script Editor: Write larger programs in the editor. Click Run Standalone to run the entire script (must have int main()) or Run in REPL to inject the editor script directly into the running session.

⚠️ AI & Code Safety Notice: Any code executed here runs as a native process inside the sandboxed container. If you are testing AI-generated C++ code, always verify it beforehand. Code execution is restricted by a 5-second timeout and 256MB memory limit to prevent runaway loops.