All Error-Code Facilities

All Error-Code Facilities

A compact index of non-throwing error reporting facilities centered on <system_error> and adjacent standard-library types.

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 Error-Code Facilities

Core types from `<system_error>`

std::error_code
std::error_condition
std::error_category
std::system_error
std::errc

Factory and conversion helpers

std::make_error_code
std::make_error_condition
implicit conversions from enums with enabled traits

Filesystem integration

std::filesystem::filesystem_error
non-throwing overloads that accept std::error_code&

Typical API style

throw-on-failure overloads for convenience
error_code out-parameter overloads for non-throwing control flow

Practical rules

Use std::error_code when local branching is expected and exceptions would be noise.
Use exceptions when failure should propagate automatically and callers are not expected to inspect codes immediately.
Keep domain-specific error enums mapped through a clear error_category.

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;
}