stdpain opened a new issue #5855:
URL: https://github.com/apache/incubator-doris/issues/5855
**Describe the bug**
eg:
```
#include <algorithm>
#include <iostream>
#include <map>
struct MC {
MC() = default;
MC(const MC& r) { std::cout << "call copy construct" << std::endl; }
size_t write(char*) const { return 0; }
int ans;
};
int main() {
MC mc0;
std::map<int, MC> st;
using iter = std::map<int, MC>::iterator;
st[0] = mc0;
st[1] = mc0;
std::cout << "start test" << std::endl;
char mem_buffer[4096];
char* buf = mem_buffer;
std::for_each(st.cbegin(), st.cend(), [&buf](const std::pair<const int,
MC>& map_entry) {
buf += map_entry.second.write(buf);
});
std::cout << "start test 2" << std::endl;
std::for_each(st.cbegin(), st.cend(), [&buf](const std::pair<int, MC>&
map_entry) {
buf += map_entry.second.write(buf);
});
return 0;
}
```
output:
```
start test
start test 2
call copy construct
call copy construct
```
so we should make `std::pair<uint32_t,RoarMap>` to `std::pair<const
uint32_t,RoarMap>`
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