在声明时初始化一个union数组

概述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},{30467.14153,5910.1427,15846.23837,7271.22705}}}; 但是我发现了以下错误： matrix 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 initializationmatrix.c:21: warning: excess elements in union initializermatrix.c:21: warning: (near initialization for ‘m[0]’)matrix.c:21: warning: excess elements in union initializermatrix.c:21: warning: (near initialization for ‘m[0]’)matrix.c:21: warning: excess elements in union initializermatrix.c:21: warning: (near initialization for ‘m[0]’)matrix.c:21: error: incompatible types in initializationmatrix.c:21: warning: excess elements in union initializermatrix.c:21: warning: (near initialization for ‘m[1]’)matrix.c:21: warning: excess elements in union initializermatrix.c:21: warning: (near initialization for ‘m[1]’)matrix.c:21: warning: excess elements in union initializermatrix.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.

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