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  1. #include <iostream>
  2. #include <cstring>
  3.  
  4. void doIt(void *p)
  5. {
  6.     double d;
  7.     std::memcpy(&d, &p, sizeof(double));
  8.     std::cout << "After: " << d << std::endl;
  9. }
  10.  
  11. int main() {
  12.     static_assert(sizeof(void*) >= sizeof(double), "void* is not large enough!");
  13.     double d = 123.45;
  14.     std::cout << "Before: " << d << std::endl;
  15.     void *p = nullptr;
  16.     std::memcpy(&p, &d, sizeof(double));
  17.     doIt(p);
  18.     return 0;
  19. }
Success #stdin #stdout 0s 4572KB
comments (?)
stdin
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Standard input is empty
stdout
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Before: 123.45
After: 123.45
https://ideone.com/DnGSVo
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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