Edit: <solved perhaps> why are std::map.insert and emplace calling the contained class destructor

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C++

Edit: am no longer seeking resolution . will resolve my particular problem via some means yet to be determined perhaps reference counting perhaps class type per template scalar value . still some investigating to do .

map.insert and map.emplace as shown below result in the destructor being called of the contained class . this does not occur for vector.push_back . i would like to inquire as to why the destructor is being called and how to avoid this occurrence if possible as it interferes w/ my code . Thank You Kindly

#include <iostream>
#include <vector>
#include <map>
using namespace std;

#define LINE_FUNCSIG cout << __LINE__ << ' ' << __FUNCSIG__<< endl;
#define COMMA ,
#define SHOW_CODE(_code_) cout << #_code_ << ' '<< endl; _code_

struct cfoo
{
     cfoo() { cout << "constructor "; LINE_FUNCSIG }
     cfoo(const cfoo&) { cout <<"copy constructor "; LINE_FUNCSIG }
     cfoo(cfoo&&) { cout << "move constructor "; LINE_FUNCSIG }
     ~cfoo() { cout<<"destructor "; LINE_FUNCSIG }
};

int main()
{
     SHOW_CODE(cfoo _cfoo;)
     vector<cfoo> _vector;
     SHOW_CODE(_vector.push_back(_cfoo);)
     map<int, cfoo> _map;
     SHOW_CODE(_map.insert({ 159 COMMA _cfoo });)
     SHOW_CODE(_map.emplace(357 COMMA cfoo());)
     cout << "FINI" << endl;
     return 0;
}

output of above :

cfoo _cfoo;
constructor 12 __cdecl cfoo::cfoo(void)
_vector.push_back(_cfoo);
copy constructor 13 __cdecl cfoo::cfoo(const struct cfoo &)
_map.insert({ 159 COMMA _cfoo });
copy constructor 13 __cdecl cfoo::cfoo(const struct cfoo &)
move constructor 14 __cdecl cfoo::cfoo(struct cfoo &&)
destructor 15 __cdecl cfoo::~cfoo(void)
_map.emplace(357 COMMA cfoo());
constructor 12 __cdecl cfoo::cfoo(void)
move constructor 14 __cdecl cfoo::cfoo(struct cfoo &&)
destructor 15 __cdecl cfoo::~cfoo(void)
FINI
destructor 15 __cdecl cfoo::~cfoo(void)
destructor 15 __cdecl cfoo::~cfoo(void)
destructor 15 __cdecl cfoo::~cfoo(void)
destructor 15 __cdecl cfoo::~cfoo(void)

What I have tried:

did some searching on web re/ map