我有如下定义的查找表,我使用的是GCC。当我编译的时候,我得到的警告是
warning: braces around scalar initializer
这个警告是什么意思?我应该如何初始化这个LUT?我是不是在初始化这个结构时犯了一个错误?
救命!!
typedef struct TECH
{
float velocity1, velocity2;
float temp;
float measure;
int id;
float storage[64];
}TECH;
struct TECH lut_model_1[2] = {{{296.001465},
{74.216972},
{2.025908},
{1.516384},
{1},
{0.001746,
0.000256, 0.006216, 0.005249, -0.001668, -0.001377, 0.009865, 0.010454, -0.000288, -0.005853, 0.010584, 0.015440, 0.000465, -0.000602, 0.004330, 0.005700, 0.017120,
0.233015, 0.034154, 0.244022, 0.007644, 0.385683, 0.042960, 0.406633, -0.007811, 0.346931, 0.040123, 0.387361, 0.007030, 0.225309, 0.017897, 0.241024, 0.003700,
0.103601, 0.060748, 0.121059, -0.045041, 0.076974, 0.070647, 0.148810, -0.022399, 0.074007, 0.054797, 0.141794, 0.010376, 0.052482, 0.045013, 0.078443, -0.019940,
-0.057353, 0.044285, 0.066622, -0.058232, -0.093817, 0.064753, 0.126611, -0.008286, -0.085634, 0.029582, 0.140443, 0.009189, -0.052974, 0.036057, 0.087536}},
{{309.270569},
{74.520226},
{2.088673},
{1.595730},
{1},
{-0.003261,
0.001452, 0.006673, 0.007092, 0.001020, 0.002904, 0.009037, 0.009587, -0.001494, 0.000296, 0.009327, 0.010013, -0.000301, -0.002727, 0.005875, 0.008888, -0.016850,
0.231185, 0.029758, 0.241629, 0.009411, 0.382748, 0.057553, 0.407984, -0.019496, 0.393691, 0.045355, 0.411033, -0.019787, 0.185746, 0.027101, 0.216863, 0.010189,
0.050463, 0.041380, 0.059462, 0.009747, 0.093188, 0.089831, 0.132579, -0.049612, 0.058789, 0.075130, 0.122026, -0.022185, 0.017041, 0.035450, 0.074255, -0.002068,
-0.061219, 0.040752, 0.087084, -0.013021, -0.106098, 0.066566, 0.140099, -0.041966, -0.073433, 0.055231, 0.125908, -0.003481, -0.050690, 0.017257, 0.085251}}};
发布于 2010-08-12 04:31:02
您应该删除单个值两边的大括号:{
和}
。
struct TECH lut_model_1[2] = {{296.001465,
74.216972,
2.025908,
1.516384,
1,
{0.001746,
0.000256, 0.006216, 0.005249, -0.001668, -0.001377, 0.009865, 0.010454, -0.000288, -0.005853, 0.010584, 0.015440, 0.000465, -0.000602, 0.004330, 0.005700, 0.017120,
0.233015, 0.034154, 0.244022, 0.007644, 0.385683, 0.042960, 0.406633, -0.007811, 0.346931, 0.040123, 0.387361, 0.007030, 0.225309, 0.017897, 0.241024, 0.003700,
0.103601, 0.060748, 0.121059, -0.045041, 0.076974, 0.070647, 0.148810, -0.022399, 0.074007, 0.054797, 0.141794, 0.010376, 0.052482, 0.045013, 0.078443, -0.019940,
-0.057353, 0.044285, 0.066622, -0.058232, -0.093817, 0.064753, 0.126611, -0.008286, -0.085634, 0.029582, 0.140443, 0.009189, -0.052974, 0.036057, 0.087536}},
{309.270569,
74.520226,
2.088673,
1.595730,
1,
{-0.003261,
0.001452, 0.006673, 0.007092, 0.001020, 0.002904, 0.009037, 0.009587, -0.001494, 0.000296, 0.009327, 0.010013, -0.000301, -0.002727, 0.005875, 0.008888, -0.016850,
0.231185, 0.029758, 0.241629, 0.009411, 0.382748, 0.057553, 0.407984, -0.019496, 0.393691, 0.045355, 0.411033, -0.019787, 0.185746, 0.027101, 0.216863, 0.010189,
0.050463, 0.041380, 0.059462, 0.009747, 0.093188, 0.089831, 0.132579, -0.049612, 0.058789, 0.075130, 0.122026, -0.022185, 0.017041, 0.035450, 0.074255, -0.002068,
-0.061219, 0.040752, 0.087084, -0.013021, -0.106098, 0.066566, 0.140099, -0.041966, -0.073433, 0.055231, 0.125908, -0.003481, -0.050690, 0.017257, 0.085251}}};
不会给出任何警告。
发布于 2010-08-12 04:56:39
在C语言中,在初始化标量值时使用额外的大括号是完全合法的,如
int x = { 5 };
即使你通常不会在真实的代码中看到这一点。在您的例子中,您正在做同样的事情,除了在您的例子中,标量值是一个更大的聚合的成员。
GCC为这样的代码生成警告。它认为你可能写了一些你不想写的东西,因为大多数时候大括号是用来启动聚合的多部分初始化器,而不是标量的独立初始化器。
<rant>
GCC关于聚合初始化器中的花括号的警告肯定是把事情搞砸了。在C语言中,{ 0 }
一直被用作通用的零初始化器。至少应该让{ 0 }
免除与大括号相关的警告,因为它的惯用值。</rant>
发布于 2010-08-12 04:48:23
这是一个标量初始化器:int foo = 3;
这是一个带大括号的标量初始化器:int foo = {3};
这是一个数组的初始值设定项,它不是标量:int foo[] = {1, 2, 3};
警告说你的struct有带大括号的标量初始化器:
typedef struct TECH
{
float velocity1, velocity2;
...
struct TECH lut_model_1[2] = {{{296.001465},
{74.216972},
...
你的代码将会工作,它只是在标量初始化器周围有多余的花括号。如果您去掉大括号并将其格式化得更好一点(我会将第一个初始化器放在它自己的行上),就不会有什么令人反感的地方了。
https://stackoverflow.com/questions/3462513
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