977ed18d
 Hu Chunming
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[/
Copyright Oliver Kowalke 2013.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt
]
[#class_promise]
[section:promise Template `promise<>`]
A __promise__ provides a mechanism to store a value (or exception) that can
later be retrieved from the corresponding __future__ object. `promise<>` and
`future<>` communicate via their underlying [link shared_state shared state].
#include <boost/fiber/future/promise.hpp>
namespace boost {
namespace fibers {
template< typename R >
class promise {
public:
promise();
template< typename __Allocator__ >
promise( __allocator_arg_t__, Allocator);
promise( promise &&) noexcept;
promise & operator=( promise &&) noexcept;
promise( promise const&) = delete;
promise & operator=( promise const&) = delete;
~promise();
void swap( promise &) noexcept;
future< R > get_future();
void set_value( R const&); // member only of generic promise template
void set_value( R &&); // member only of generic promise template
void set_value( R &); // member only of promise< R & > template
void set_value(); // member only of promise< void > template
void set_exception( std::exception_ptr p);
};
template< typename R >
void swap( promise< R > &, promise< R > &) noexcept;
}
[heading Default constructor]
promise();
[variablelist
[[Effects:] [Creates a promise with an empty [link shared_state shared state].]]
[[Throws:] [Exceptions caused by memory allocation.]]
]
[heading Constructor]
template< typename __Allocator__ >
promise( __allocator_arg_t__, Allocator alloc);
[variablelist
[[Effects:] [Creates a promise with an empty [link shared_state shared state] by using `alloc`.]]
[[Throws:] [Exceptions caused by memory allocation.]]
[[See also:] [__allocator_arg_t__]]
]
[heading Move constructor]
promise( promise && other) noexcept;
[variablelist
[[Effects:] [Creates a promise by moving the [link shared_state shared state] from `other`.]]
[[Postcondition:] [`other` contains no valid shared state.]]
[[Throws:] [Nothing.]]
]
[heading Destructor]
~promise();
[variablelist
[[Effects:] [Destroys `*this` and abandons the [link shared_state shared
state] if shared state is ready; otherwise stores __future_error__ with error
condition __broken_promise__ as if by [member_link promise..set_exception]:
the shared state is set ready.]]
]
[operator_heading promise..operator_assign..operator=]
promise & operator=( promise && other) noexcept;
[variablelist
[[Effects:] [Transfers the ownership of [link shared_state shared state] to `*this`.]]
[[Postcondition:] [`other` contains no valid shared state.]]
[[Throws:] [Nothing.]]
]
[member_heading promise..swap]
void swap( promise & other) noexcept;
[variablelist
[[Effects:] [Swaps the [link shared_state shared state] between other and `*this`.]]
[[Throws:] [Nothing.]]
]
[member_heading promise..get_future]
future< R > get_future();
[variablelist
[[Returns:] [A __future__ with the same [link shared_state shared state].]]
[[Throws:] [__future_error__ with __already_retrieved__ or __no_state__.]]
]
[member_heading promise..set_value]
void set_value( R const& value); // member only of generic promise template
void set_value( R && value); // member only of generic promise template
void set_value( R & value); // member only of promise< R & > template
void set_value(); // member only of promise< void > template
[variablelist
[[Effects:] [Store the result in the [link shared_state shared state] and marks the state as ready.]]
[[Throws:] [__future_error__ with __already_satisfied__ or __no_state__.]]
]
[member_heading promise..set_exception]
void set_exception( std::exception_ptr);
[variablelist
[[Effects:] [Store an exception pointer in the [link shared_state shared state] and marks the state as ready.]]
[[Throws:] [__future_error__ with __already_satisfied__ or __no_state__.]]
]
[function_heading_for swap..promise]
template< typename R >
void swap( promise< R > & l, promise< R > & r) noexcept;
[variablelist
[[Effects:] [Same as `l.swap( r)`.]]
]
[endsect]
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