标准库标头 <contracts> (C++26)

// 全部为独立
namespace std::contracts {
 
  enum class assertion_kind : /* 未指明 */ {
    pre = 1,
    post = 2,
    assert = 3
  };
 
  enum class evaluation_semantic : /* 未指明 */ {
    ignore = 1,
    observe = 2,
    enforce = 3,
    quick_enforce = 4
  };
 
  enum class detection_mode : /* 未指明 */ {
    predicate_false = 1,
    evaluation_exception = 2
  };
 
  // 类 contract_violation
  class contract_violation;
 
  void invoke_default_contract_violation_handler(const contract_violation&);
}

namespace std::contracts {
  class contract_violation
  {
    // 没有用户可访问的构造函数
  public:
    contract_violation(const contract_violation&) = delete;
    contract_violation& operator=(const contract_violation&) = delete;
    /* 见描述 */ ~contract_violation();
    const char* comment() const noexcept;
    contracts::detection_mode detection_mode() const noexcept;
    exception_ptr evaluation_exception() const noexcept;
    bool is_terminating() const noexcept;
    assertion_kind kind() const noexcept;
    source_location location() const noexcept;
    evaluation_semantic semantic() const noexcept;
  };
}