weak_ptr, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <vector>
#include <memory>
#include <algorithm>

struct B { ~B() { std::cout << "B::destructor " << this << '\n' ; } };

void debug_clean_cache( std::vector< std::weak_ptr >& cache )
{
 static int cnt = 0 ;
 std::cout << "\ndebug_clean # " << ++cnt << "\n--------------\n" ;

// erase all expired objects
    cache.erase( std::remove_if( std::begin(cache), std::end(cache),
                                 [] ( auto& wp ) { return wp.expired() ; } ),
                 cache.end() ) ;

// dump addresses of objects that are still alive
 std::cout << "size == " << cache.size() << " [ " ;
 for( const auto& wp : cache ) std::cout << "object@" << wp.lock().get() << " " ;
 std::cout << "]\n\n" ;
}

int main()
{
 std::vector< std::weak_ptr > cached_weak_refs ;

auto ptr1 = std::make_shared() ;
 cached_weak_refs.emplace_back(ptr1) ;

auto ptr2 = std::make_shared() ;
 cached_weak_refs.emplace_back(ptr2) ;

auto ptr3 = std::make_shared() ;
 cached_weak_refs.emplace_back(ptr3) ;

debug_clean_cache(cached_weak_refs) ;

ptr3 = nullptr ;
    debug_clean_cache(cached_weak_refs) ;

ptr1 = nullptr ;
    debug_clean_cache(cached_weak_refs) ;

ptr2 = nullptr ;
    debug_clean_cache(cached_weak_refs) ;
}

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Compilation time: 1,74 sec, absolute running time: 0,32 sec, absolute service time: 2,08 sec