All Formatter and Printing Customization Points

All Formatter and Printing Customization Points

A compact scan page for formatter specializations, format context types, and print-oriented customization hooks in modern C++.

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 Formatter and Printing Customization Points

Core formatting customization types

std::formatter<T, CharT> specialization points
std::format_context
std::wformat_context
std::format_parse_context
std::basic_format_context

Main formatting entry points

std::format
std::vformat
std::format_to
std::formatted_size
std::print
std::println

What customization usually means

define parse() for format-spec parsing
define format() for value emission into the format context
preserve ordinary formatting semantics and error expectations when specializing

Practical rules

Specialize formatters when a domain type needs first-class formatting support.
Keep formatter behavior unsurprising and stable across overload sites.
Prefer explicit, readable formatting contracts over clever mini-languages hidden inside custom types.

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;
}