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#include <new>
 
void f() {
  char c; // Used elsewhere in the function
  unsigned char buffer[sizeof(long)];
  long *lp = ::new (buffer) long;
 
  // ...
}

Compliant Solution (

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alignas)

This In this compliant solution ensures that the long is constructed into a buffer of sufficient size and with suitable alignment, the alignas declaration specifier is used to ensure the buffer is appropriately aligned for a long:

#include <new>
 
void f() {
  char c; // Used elsewhere in the function
  std::aligned_storage<sizeofalignas(long), alignof unsigned char buffer[sizeof(long)>::type buffer];
  long *lp = ::new (&buffer) long;
 
  // ...
}

Compliant Solution (

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std::aligned_storage)

In this This compliant solution , the alignas declaration specifier is used to ensure the buffer is appropriately aligned for a longensures that the long is constructed into a buffer of sufficient size and with suitable alignment:

#include <new>
 
void f() {
  char c; // Used elsewhere in the function
  alignasstd::aligned_storage<sizeof(long) unsigned char buffer[sizeof, alignof(long)]>::type buffer;
  long *lp = ::new (&buffer) long;
 
  // ...
}

Noncompliant Code Example (Failure to Account For Array Overhead)

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