Section 3: library functions
std::system_error::what – std::system_error::what Synopsis virtual const char* what() const noexcept; (since C++11) Returns the explanatory string. Parameters (none) Return value Pointer to a null-terminated string with explanatory information. See also returns error code code (public member function)
std::system_error::system_error – std::system_error::system_error Synopsis system_error(std::error_code ec); (1)(since C++ 11) system_error(std::error_code ec, const std::string &what_arg); (2)(since C++ 11) system_error(std::error_code ec, const char *what_arg); (2)(since C++ 11) system_error(int ev, const std::error_category &ecat); (3)(since C++ 11) system_error(int ev, const std::error_category &ecat, (4)(since C++ 11) const std::string &what_arg); system_error(int ev, const std::error_category &ecat, (4)(since C++ 11) const char *what_arg);…
std::system_error::code – std::system_error::code Synopsis const std::error_code &code() const noexcept; (since C++ 11) Returns the stored error code. Parameters (none) Return value The stored error code. See also what returns explanatory string (virtual public member function) [virtual]
std::system_error – std::system_error Synopsis Defined in header <system_error> class system_error; (since C++11) std::system_error is the type of the exception thrown by various library functions (typically the functions that interface with the OS facilities, e.g. the constructor of std::thread) when the exception has an associated std::error_code, which may be reported. std-system error-inheritance.svg Inheritance diagram Member functions…
std::system_category – std::system_category Synopsis Defined in header <system_error> const std::error_category& system_category() noexcept; (since C++11) Obtains a reference to the static error category object for errors reported by the operating system. The object is required to override the virtual function std::error_category::name() to return a pointer to the string "system". It is also required to override the…
std::system – std::system Synopsis Defined in header<cstdlib> int system(const char *command); Calls the host environment’s command processor (e.g. /bin/sh, cmd.exe, command.com) with the parameter command. Returns an implementation-defined value (usually the value that the invoked program returns). If command is a null pointer, checks if the host environment has a command processor and returns a…
std::swap_ranges – std::swap_ranges Synopsis Defined in header <algorithm> template< class ForwardIt1, class ForwardIt2 > ForwardIt2 swap_ranges( ForwardIt1 first1, ForwardIt1 last1, (until C++20) ForwardIt2 first2 ); template< class ForwardIt1, class ForwardIt2 > constexpr ForwardIt2 swap_ranges( ForwardIt1 first1, ForwardIt1 last1, (1) (since C++20) ForwardIt2 first2 ); template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2 > ForwardIt2 swap_ranges( ExecutionPolicy&&…
std::swap – std::swap Synopsis Defined in header<algorithm>(until C++ 11) Defined in header<utility>(since C++ 11) template <class T> (until C++ 11) void swap(T &a, T &b); template <class T> (since C++ 11) void swap(T &a, T &b) noexcept(/* see below */); (until C++ 20) template <class T> (1)(since C++ 20) constexpr void swap(T &a, T &b)…
std::swap(std::weak_ptr) – std::swap(std::weak_ptr) Synopsis template <class T> (since C++ 11) void swap(weak_ptr<T> &lhs, weak_ptr<T> &rhs) noexcept; Specializes the std::swap algorithm for std::weak_ptr. Swaps the pointers of lhs and rhs. Calls lhs.swap(rhs). Parameters lhs, rhs – smart pointers whose contents to swap Return value (none) Complexity Constant See also swaps the values of two objects swap…
std::swap(std::vector) – std::swap(std::vector) Synopsis template <class T, class Alloc> void swap(vector<T, Alloc> &lhs, (until C++ 17) vector<T, Alloc> &rhs); template <class T, class Alloc> void swap(vector<T, Alloc> &lhs, (since C++ 17) vector<T, Alloc> &rhs) noexcept(/* see below */); Specializes the std::swap algorithm for std::vector. Swaps the contents of lhs and rhs. Calls lhs.swap(rhs). Parameters lhs,…
std::swap(std::variant) – std::swap(std::variant) Synopsis Defined in header<variant> template <class… Types> (since C++ 17) void swap(variant<Types…> &lhs, variant<Types…> &rhs) noexcept(/* see below */); Overloads the std::swap algorithm for std::variant. Effectively calls lhs.swap(rhs). This overload only participates in overload resolution if is_move_constructible_v<T_i> and is_swappable_v<T_i> are both true for all T_i in Types… Parameters lhs, rhs – variant…
std::swap(std::valarray) – std::swap(std::valarray) Synopsis template <class T> void swap(valarray<T> &lhs, valarray<T> &rhs); Specializes the std::swap algorithm for std::valarray. Swaps the contents of lhs and rhs. Calls lhs.swap(rhs). Parameters lhs, rhs – valarrays whose contents to swap Return value (none) Complexity Constant. See also swaps with another valarray swap (public member function)
std::swap(std::unordered_set) – std::swap(std::unordered_set) Synopsis template <class Key, class Hash, class KeyEqual, class Alloc> (since C++ 11) void swap(unordered_set<Key, Hash, KeyEqual, Alloc> &lhs, (until C++ 17) unordered_set<Key, Hash, KeyEqual, Alloc> &rhs); template <class Key, class Hash, class KeyEqual, class Alloc> void swap(unordered_set<Key, Hash, KeyEqual, Alloc> &lhs, (since C++ 17) unordered_set<Key, Hash, KeyEqual, Alloc> &rhs) noexcept(/* see…
std::swap(std::unordered_multiset) – std::swap(std::unordered_multiset) Synopsis template <class Key, class Hash, class KeyEqual, class Alloc> (since C++ 11) void swap(unordered_multiset<Key, Hash, KeyEqual, Alloc> &lhs, (until C++ 17) unordered_multiset<Key, Hash, KeyEqual, Alloc> &rhs); template <class Key, class Hash, class KeyEqual, class Alloc> void swap(unordered_multiset<Key, Hash, KeyEqual, Alloc> &lhs, (since C++ 17) unordered_multiset<Key, Hash, KeyEqual, Alloc> &rhs) noexcept(/* see…
std::swap(std::unordered_multimap) – std::swap(std::unordered_multimap) Synopsis template <class Key, class T, class Hash, class KeyEqual, class Alloc> (since C++ 11) void swap(unordered_multimap<Key, T, Hash, KeyEqual, Alloc> &lhs, (until C++ 17) unordered_multimap<Key, T, Hash, KeyEqual, Alloc> &rhs); template <class Key, class T, class Hash, class KeyEqual, class Alloc> void swap(unordered_multimap<Key, T, Hash, KeyEqual, Alloc> &lhs, (since C++ 17)…
std::swap(std::unordered_map) – std::swap(std::unordered_map) Synopsis template <class Key, class T, class Hash, class KeyEqual, class Alloc> (since C++ 11) void swap(unordered_map<Key, T, Hash, KeyEqual, Alloc> &lhs, (until C++ 17) unordered_map<Key, T, Hash, KeyEqual, Alloc> &rhs); template <class Key, class T, class Hash, class KeyEqual, class Alloc> void swap(unordered_map<Key, T, Hash, KeyEqual, Alloc> &lhs, (since C++ 17)…
std::swap(std::unique_ptr) – std::swap(std::unique_ptr) Synopsis template <class T, class Deleter> (since C++ 11) void swap(unique_ptr<T, Deleter> &lhs, unique_ptr<T, Deleter> &rhs) noexcept; Specializes the std::swap algorithm for std::unique_ptr. Swaps the pointers of lhs and rhs. Calls lhs.swap(rhs). This function does not participate in overload resolution unless std::is_swappable<D>::value is true. (since C++17) Parameters lhs, rhs – smart pointers…
std::swap(std::unique_lock) – std::swap(std::unique_lock) Synopsis template <class Mutex> void swap(unique_lock<Mutex> &lhs, (since C++ 11) unique_lock<Mutex> &rhs) noexcept; Specializes the std::swap algorithm for std::unique_lock. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs). Parameters lhs, rhs – lock wrappers whose states to swap Return value (none) Example This section is incomplete Reason: no example…
std::swap(std::tuple) – std::swap(std::tuple) Synopsis template <class… Types> (since C++ 11) void swap(tuple<Types…> &lhs, tuple<Types…> &rhs) noexcept(/* see below */); (until C++ 20) template <class… Types> constexpr void(since C++ 20) swap(tuple<Types…> &lhs, tuple<Types…> &rhs) noexcept(/* see below */); Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs). This function does not participate in overload resolution…
std::swap(std::thread) – std::swap(std::thread) Synopsis void swap(thread &lhs, thread &rhs) noexcept; (since C++ 11) Overloads the std::swap algorithm for std::thread. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs). Parameters lhs, rhs – threads whose states to swap Return value (none) Example // Run this code #include <iostream> #include <thread> #include <chrono> void…