Read these Expert C++ snippets line by line — each one comes with a written breakdown of what the code does and why.
Substitution Failure Is Not An Error (SFINAE) allows the compiler to discard template overloads that would result in invalid code. std::enable_if_t leverages this to enable a function only when a s…
Open snippet →CRTP is a technique where a class derives from a template instantiation using itself as an argument. It enables static polymorphism (compile-time dispatch), which avoids the overhead of virtual fun…
Open snippet →Placement new allows you to construct an object at a pre-allocated memory address. This is critical for high-performance systems and custom allocators where heap fragmentation or allocation overhea…
Open snippet →Perfect forwarding ensures that a function template can pass its arguments to another function while preserving their original value category (lvalue or rvalue). This is achieved using universal re…
Open snippet →Introduced in C++17, fold expressions simplify operations on variadic template parameter packs. Instead of recursive template calls, you can use a single expression to apply an operator across all…
Open snippet →Concepts allow you to define semantic requirements on template arguments. Instead of cryptic compiler errors from deep within a template, the compiler checks the constraint at the call site, leadin…
Open snippet →C++20 coroutines are functions that can suspend and resume execution. They are controlled by a 'promise_type' which defines the behavior of the coroutine state machine, such as where it initially s…
Open snippet →Type erasure is a technique used to store objects of different types that provide a specific interface (like 'render()') without requiring them to inherit from a common base class. This is how std:…
Open snippet →C++23 introduced 'deduced this', allowing member functions to take 'this' as an explicit parameter. This simplifies writing code that depends on the value category (lvalue/rvalue) or the cv-qualifi…
Open snippet →The 'consteval' keyword (C++20) specifies that a function must produce a compile-time constant. Unlike 'constexpr', which allows both compile-time and run-time execution, 'consteval' strictly forbi…
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