c++ - 将指针转换为 float ？

Question

我有一个unsigned char*。通常这指向一大块数据，但在某些情况下，指针是数据，即。将 int 值转换为 unsigned char* 指针 (unsigned char* intData = (unsigned char*)myInteger;)，反之亦然。

但是，我需要使用 float 值来执行此操作，但它一直给我转换错误。

unsigned char* data;
float myFloat = (float)data;

我该怎么做？

Answer 1

位播:

template <class Dest, class Source>
inline Dest bit_cast(Source const &source) {
    static_assert(sizeof(Dest)==sizeof(Source), "size of destination and source objects must be equal");
    static_assert(std::is_trivially_copyable<Dest>::value, "destination type must be trivially copyable.");
    static_assert(std::is_trivially_copyable<Source>::value, "source type must be trivially copyable");

    Dest dest;
    std::memcpy(&dest, &source, sizeof(dest));
    return dest;
}

用法:

char *c = nullptr;
float f = bit_cast<float>(c);
c = bit_cast<char *>(f);