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80c663882a
Summary: First draft. Unit tests pass. Test Plan: unit tests attached Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D3969
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#ifndef _THRIFT_ASYNC_SIMPLECALLBACK_H_
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#define _THRIFT_ASYNC_SIMPLECALLBACK_H_ 1
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#include "thrift/lib/cpp/Thrift.h"
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namespace apache { namespace thrift {
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/**
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* A template class for forming simple method callbacks with either an empty
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* argument list or one argument of known type.
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*
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* For more efficiency where tr1::function is overkill.
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*/
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template<typename C, ///< class whose method we wish to wrap
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typename A = void, ///< type of argument
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typename R = void> ///< type of return value
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class SimpleCallback {
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typedef R (C::*cfptr_t)(A); ///< pointer-to-member-function type
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cfptr_t fptr_; ///< the embedded function pointer
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C* obj_; ///< object whose function we're wrapping
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public:
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/**
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* Constructor for empty callback object.
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*/
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SimpleCallback() :
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fptr_(NULL), obj_(NULL) {}
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/**
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* Construct callback wrapper for member function.
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*
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* @param fptr pointer-to-member-function
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* @param "this" for object associated with callback
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*/
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SimpleCallback(cfptr_t fptr, const C* obj) :
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fptr_(fptr), obj_(const_cast<C*>(obj))
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{}
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/**
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* Make a call to the member function we've wrapped.
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*
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* @param i argument for the wrapped member function
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* @return value from that function
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*/
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R operator()(A i) const {
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(obj_->*fptr_)(i);
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}
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operator bool() const {
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return obj_ != NULL && fptr_ != NULL;
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}
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~SimpleCallback() {}
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};
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/**
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* Specialization of SimpleCallback for empty argument list.
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*/
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template<typename C, ///< class whose method we wish to wrap
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typename R> ///< type of return value
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class SimpleCallback<C, void, R> {
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typedef R (C::*cfptr_t)(); ///< pointer-to-member-function type
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cfptr_t fptr_; ///< the embedded function pointer
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C* obj_; ///< object whose function we're wrapping
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public:
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/**
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* Constructor for empty callback object.
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*/
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SimpleCallback() :
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fptr_(NULL), obj_(NULL) {}
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/**
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* Construct callback wrapper for member function.
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*
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* @param fptr pointer-to-member-function
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* @param obj "this" for object associated with callback
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*/
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SimpleCallback(cfptr_t fptr, const C* obj) :
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fptr_(fptr), obj_(const_cast<C*>(obj))
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{}
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/**
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* Make a call to the member function we've wrapped.
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*
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* @return value from that function
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*/
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R operator()() const {
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(obj_->*fptr_)();
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}
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operator bool() const {
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return obj_ != NULL && fptr_ != NULL;
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}
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~SimpleCallback() {}
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};
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}} // apache::thrift
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#endif /* !_THRIFT_ASYNC_SIMPLECALLBACK_H_ */
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