我正在尝试在声明时初始化以下union数组：
typedef union { __m128d m; float f[4]; } mat;
mat m[2] = { {{30467.14153,5910.1427,15846.23837,7271.22705},{30467.14153,7271.22705}}};
但是我发现了以下错误：
matrix.c: In function ‘main’: matrix.c:21: error: incompatible types in initialization matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[0]’) matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[0]’) matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[0]’) matrix.c:21: error: incompatible types in initialization matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[1]’) matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[1]’) matrix.c:21: warning: excess elements in union initializer matrix.c:21: warning: (near initialization for ‘m[1]’)
解决方法
引用
this page：
With C89-style initializers,structure members must be initialized in the order declared,and only the first member of a union can be initialized.
所以,要么先将float数组放入,要么尽可能使用C99并写入：
mat m[2] = { { .f = { /* and so on */ } },/* ... */ };
重要的是.f.
