All Callable Wrappers and Adapters

All Callable Wrappers and Adapters

A compact scan page for invocation utilities, function wrappers, adapters, and callable helper types in the standard library.

How to use this reference page

Use reference pages to confirm names, categories, nearby facilities, and the constraints that matter before writing or reviewing code.

Scan the top of the page first to identify the primary types, functions, or algorithm families involved.
Use the nearby-page links when your question is really about a companion header, related algorithm family, or broader subsystem.
Validate tricky behavior with a small compileable example before relying on memory for details like invalidation, ordering, allocation, or lifetime rules.

All Callable Wrappers and Adapters

Direct invocation utilities

std::invoke
std::invoke_r
std::mem_fn

Type-erased and storing wrappers

std::function
std::move_only_function
std::copyable_function
std::function_ref is not in the standard library as of C++23

Binding and negation adapters

std::bind
std::bind_front
std::not_fn

Reference-preserving adapters

std::reference_wrapper<T>
std::ref
std::cref

Standard function objects

arithmetic function objects such as std::plus, std::minus, std::multiplies
comparison objects such as std::less, std::greater, std::equal_to
logical objects such as std::logical_and, std::logical_or, std::logical_not
bitwise objects such as std::bit_and, std::bit_or, std::bit_xor

Practical rules

Prefer lambdas over std::bind for readability.
Prefer templates or forwarding call sites over std::function in hot paths.
Use reference wrappers only when a copy-based API must carry reference semantics.

Example in practice

int main() {
    // Pick one facility from this reference page.
    // Write the smallest program that exercises its main precondition,
    // complexity rule, or lifetime constraint before scaling up.
    return 0;
}