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Showing content from https://en.cppreference.com/w/cpp/language/../named_req/../thread/thread/thread.html below:

std::thread::thread - cppreference.com

thread() noexcept;

(1) (since C++11)

thread( thread&& other ) noexcept;

(2) (since C++11)

template< class F, class... Args >
explicit thread( F&& f, Args&&... args );

(3) (since C++11)

thread( const thread& ) = delete;

(4) (since C++11)

Constructs a new std::thread object.

1) Creates a new std::thread object which does not represent a thread.

2) Move constructor. Constructs the std::thread object to represent the thread of execution that was represented by other. After this call other no longer represents a thread of execution.

3)

Creates a new

std::thread

object and associates it with a thread of execution. The new thread of execution starts executing:

The calls of decay-copy are evaluated(until C++23)The values produced by auto are materialized(since C++23)

in the current thread, so that any exceptions thrown during evaluation and copying/moving of the arguments are thrown in the current thread, without starting the new thread.

This overload participates in overload resolution only if

std::decay<F>::type(until C++20)std::remove_cvref_t<F>(since C++20)

is not the same type as

std::thread

.

The completion of the invocation of the constructor

synchronizes with

the beginning of the invocation of the copy of

f

on the new thread of execution.

4) The copy constructor is deleted; threads are not copyable. No two std::thread objects may represent the same thread of execution.

[edit] Parameters other - another thread object to construct this thread object with f - Callable object to execute in the new thread args - arguments to pass to the new function [edit] Postconditions 2) other.get_id()

equal to

std::thread::id()

and

get_id()

returns the value of

other.get_id()

prior to the start of construction.

[edit] Exceptions 3) std::system_error

if the thread could not be started. The exception may represent the error condition

std::errc::resource_unavailable_try_again

or another implementation-specific error condition.

[edit] Notes

The arguments to the thread function are moved or copied by value. If a reference argument needs to be passed to the thread function, it has to be wrapped (e.g., with std::ref or std::cref).

Any return value from the function is ignored. If the function throws an exception, std::terminate is called. In order to pass return values or exceptions back to the calling thread, std::promise or std::async may be used.

[edit] Example

Possible output:

Thread 1 executing
Thread 2 executing
Thread 3 executing
Thread 4 executing
Thread 3 executing
Thread 1 executing
Thread 2 executing
Thread 4 executing
Thread 2 executing
Thread 3 executing
Thread 1 executing
Thread 4 executing
Thread 3 executing
Thread 2 executing
Thread 1 executing
Thread 4 executing
Thread 3 executing
Thread 1 executing
Thread 2 executing
Thread 4 executing
Final value of n is 5
Final value of f.n (foo::n) is 5
Final value of b.n (baz::n) is 0
[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2097 C++11 for overload (3), F could be std::thread F is constrained LWG 3476 C++20 overload (3) directly required (the decayed types of)
F and the argument types to be move constructible removed these
requirements[1]
  1. ↑ The move-constructibility is already indirectly required by std::is_constructible_v.
[edit] References
[edit] See also

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