存储在struct中的SWIG调用函数指针

问题描述

我的结构如下:

struct power_model {
    int64_t (*estimate_energy)(statistics *stats, statistics *scaled_stats, parameters *from, parameters *to, energy_container *energy_container);
    int64_t (*estimate_performance)(statistics *stats, parameters *params);
    uint32_t (*freq_to_volt)(uint32_t freq);
};

我的代码包含多个电源模型.我想用SWIG包装这些模型并将它们暴露给Python，以便我可以运行单元测试.

There are multiple power models that my code contains.I would like to wrap these models with SWIG and expose them to Python so that I can run my unit tests.

尽管SWIG文档讨论了公开函数指针，但并未讨论结构中包含的函数指针.我试图将调用封装在接口文件中

While the SWIG documentation talks about exposing function pointers, it does not talk about function pointers contained within structs.I tried to encapsulate the calls in my interface file

%{
#include "models.h"
%}

%include "models.h"

%extend power_model {
  %pythoncallback;
  int64_t (*estimate_energy)(statistics *stats, statistics *scaled_stats, parameters *from, parameters *to, energy_container *energy_container);
  int64_t (*estimate_performance)(statistics *stats, parameters *params);
  uint32_t (*freq_to_volt)(uint32_t freq);
  %nopythoncallback;
}

我还尝试使用%constant为字段名称添加前缀.

I also tried prefixing the field names with %constant.

使用这些方法，我总是会遇到相同的错误:

With these approaches, I always end up with the same error:

In [3]: model.estimate_energy()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-b2e3ace2fc9b> in <module>()
----> 1 model.estimate_energy()

TypeError: 'SwigPyObject' object is not callable

如何调用struct power_model中包含的函数指针引用的基础函数?

How can I call the underlying functions referenced by the function pointers contained within struct power_model?

修改:为了详细说明我的设置，我还提供了两个附加文件，以更好地说明我正在尝试通过power_model界面实现的设置.

Edit:To elaborate on my setup, I am also sources of two additional files to better explain the setup I'm trying to achieve with the power_model interface.

nexus5.c

static int64_t estimate_energy(statistics *stats, statistics *scaled_stats, parameters *from, parameters *to, energy_container *energy) {
    ...
}
static int64_t estimate_performance(statistics *stats, parameters *params) {
    ...
}
static uint32_t freq_to_volt(uint32_t freq) {
    ...
}

struct power_model nexus5_power_model = {
     .estimate_energy = estimate_energy,
     .estimate_performance = estimate_performance,
     .freq_to_volt = freq_to_volt,
};

galaxy_s.c

static int64_t estimate_energy(statistics *stats, statistics *scaled_stats, parameters *from, parameters *to, energy_container *energy) {
    ...
}
static int64_t estimate_performance(statistics *stats, parameters *params) {
    ...
}
static uint32_t freq_to_volt(uint32_t freq) {
    ...
}

struct power_model galaxy_s_power_model = {
     .estimate_energy = estimate_energy,
     .estimate_performance = estimate_performance,
     .freq_to_volt = freq_to_volt,
};

推荐答案

这对我有用.解决方案5是首选方案.

This works for me. The solution 5 is the preferred one.

test.i

%module test

%{
#include "test.h"
%}

// Solution 5 (right one)
%pythoncallback;
double f5(double);
%nopythoncallback;
%ignore f5;

%include "test.h"    

test.h

typedef double (*fptr_t)(double);

// Solution 5
double f5(double x) {
  return x*x;
}

typedef struct bla {
  fptr_t f;
} bla;

在Python内部

import test
s = test.bla
# Assign function pointer
s.f = test.f5
# Execute
s.f(2)

f是一个以函数指针作为参数的函数

f is a function taking a function pointer as argument

这篇关于存储在struct中的SWIG调用函数指针的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！