是否保证memset将结构中的填充位清零? [英] Is it guaranteed that memset will zero out the padding bits in a structure?

问题描述

通常，按照C标准，是否保证memset()为0会使C结构中的填充位清零?

In general ,as per C standard is it guaranteed that memset() with 0 will zero out the padding bits in a C structure?

那gcc呢?

例如，类似:

struct MyStruct
{
    unsigned char   member1;
    unsigned int    member2;
    char        member3;
    unsigned char   member4;
    float       member5;    
};

struct MyStruct ms;

memset(&ms, 0, sizeof( struct MyStruct));

推荐答案

也许值得一提的是，memset对您的结构(或数组，基元或任何内存块)一无所知)，因此即使它希望保留填充位完整无缺，它甚至都不知道它们在哪里.

Perhaps worth noting that memset doesn't know anything about your struct (or array, or primitive, or any chunk of memory whatsoever that you happen to unleash it on), so even if it wanted to leave the padding bits intact, it wouldn't even know where they are.

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