C用循环初始化结构

Question

下面我在我正在编写的程序中有一个结构的代码。我希望能够在某种循环中初始化这些参数，但我似乎不知道如何配置.water/.air/.purge属性以使用循环进行更新。nozzle_count是16岁，所以我想找到一种方法来实现下面的代码，而不需要复制和粘贴它16次。如有任何意见，我将不胜感激。谢谢!

static nozzle nozzles[nozzle_count] = {
    {
        .water = C1_WATER, .air = C1_AIR, .purge = C1_PURGE,
        .interval = 15*60*1000, .cycle = 0*3*5*1000, .purge_length = 0*4*1000,
        .state = WAIT
    },
    {
        .water = C2_WATER, .air = C2_AIR, .purge = C2_PURGE,
        .interval = 2*60*1000, .cycle = 1*3*1000, .purge_length = 0*4*1000,
        .state = WAIT
    },
    {
        .water = C3_WATER, .air = C3_AIR, .purge = C3_PURGE,
        .interval = 2*60*1000, .cycle = 0*1*5*1000, .purge_length = 0*4*1000,
        .state = WAIT
    }
    {
        .water = C4_WATER, .air = C4_AIR, .purge = C4_PURGE,
        .interval = 2*60*1000, .cycle = 0*1*5*1000, .purge_length = 0*4*1000,
        .state = WAIT
    }
    {
        .water = C5_WATER, .air = C5_AIR, .purge = C5_PURGE,
        .interval = 2*60*1000, .cycle = 0*1*5*1000, .purge_length = 0*4*1000,
        .state = WAIT
    }
};

Answer 1

我认为您的代码看起来非常好，即使数组的长度从5增加到16。有两个可能的建议。

如果您删除了C99初始化的绒毛，那么所有内容都可以放在一行中：

static nozzle nozzles[nozzle_count] = {
//    water     air     purge     interval    cycle       purge_length state
//    --------  ------  --------  ----------  ----------  ------------ ----
    { C1_WATER, C1_AIR, C1_PURGE, 15*60*1000, 0*3*5*1000, 0*4*1000,    WAIT },
//  ...
};

这是一个简单的表，只有16行长，这是清楚和明显的，而且易于维护。

其次，如果您需要保持每个成员的初始化，您可以将其括在一个宏中，这有助于实现DRY：

#define FOO(a, b, c, d, e, f, g)                                 \
    {                                                            \
       .water = (a), .air = (b), .purge = (c),                   \
       .interval = (d), .cycle = (e),  .purge_length = (f),      \
       .state = (b)                                              \
    }

static nozzle nozzles[nozzle_count] = {
//    water     air     purge     interval    cycle       purge_length state
//    --------  ------  --------  ----------  ----------  ------------ ----
 FOO( C1_WATER, C1_AIR, C1_PURGE, 15*60*1000, 0*3*5*1000, 0*4*1000,    WAIT ),
//  ...
};

Answer 2

我唯一能想到的解决办法是：

const TYPE_OF_CxPURGE PURGE[] = {...};
const TYPE_OF_CxAIR AIR[] = {....};
const TYPE_OF_CxWATER WATER[] = {....};

在代码的某个地方

for(size_t index = 0; index < sizeof(nozzles) / sizeof(nozzles[0]); index ++)
{
    nozzles.water = WATER[index];
    nozzles.air = AIR[index]; 
    nozzles.purge = PURGE[index];
    nozzles.interval = 15*60*1000; 
    nozzles.cycle = 0*3*5*1000; 
    nozzles.purge_length = 0*4*1000,
    nozzles.state = WAIT
}

但我认为正常的初始化更好。只有16个元素。如果您有更多的内容，只需编写脚本来生成此初始化代码。

Answer 3

你能给出*_WATER，*_AIR，*_PURGE的定义吗？

for (i = 0; i < nozzle_count; i++)
{
    nozzles[i] = (struct nozzle){WATER[i], AIR[i], PURGE[i], 15*60*1000, 0, 0, WAIT};
}