Contract support (C++26)

 

C++

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Freestanding and hosted

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Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

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Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

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Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

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Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros(C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support(C++20) Contract support(C++26) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

General utilities Function objects Bit manipulation(C++20) bitset hash (C++11) Relational operators(deprecated in C++20) rel_ops::operator!=rel_ops::operator>    rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)   cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23)

 

Contract support

Contract-violation information

contract_violation (C++26)

assertion_kind (C++26)

evaluation_semantic (C++26)

detection_mode (C++26)

Helper functions

invoke_default_contract_violation_handler (C++26)

 

The contract support library defines several types for reporting information about contract violations.

Contract-violation information

Defined in header <contracts>
Defined in namespace std::contracts
contract_violation (C++26)	the type holding the contract-violation information (class)
assertion_kind (C++26)	the kind of the contract assertion violated (enum)
evaluation_semantic (C++26)	the evaluation semantic when the contract violation occurs (enum)
detection_mode (C++26)	the reason that causes the contract violation (enum)

Helper functions

Defined in header <contracts>
Defined in namespace std::contracts
invoke_default_contract_violation_handler (C++26)	invokes the default contract-violation handler (function)

Notes

Feature-test macro	Value	Std	Feature
__cpp_lib_contracts	202502L	(C++26)	Contract support library