hash_map::lower_bound (STL/CLR)
Finds beginning of range that matches a specified key.
iterator lower_bound(key_type key);
Parameters
- key
Key value to search for.
Remarks
The member function determines the first element X in the controlled sequence that hashes to the same bucket as key and has equivalent ordering to key. If no such element exists, it returns hash_map::end (STL/CLR)(); otherwise it returns an iterator that designates X. You use it to locate the beginning of a sequence of elements currently in the controlled sequence that match a specified key.
Example
// cliext_hash_map_lower_bound.cpp
// compile with: /clr
#include <cliext/hash_map>
typedef cliext::hash_map<wchar_t, int> Myhash_map;
int main()
{
Myhash_map c1;
c1.insert(Myhash_map::make_value(L'a', 1));
c1.insert(Myhash_map::make_value(L'b', 2));
c1.insert(Myhash_map::make_value(L'c', 3));
// display contents " [a 1] [b 2] [c 3]"
for each (Myhash_map::value_type elem in c1)
System::Console::Write(" [{0} {1}]", elem->first, elem->second);
System::Console::WriteLine();
System::Console::WriteLine("lower_bound(L'x')==end() = {0}",
c1.lower_bound(L'x') == c1.end());
Myhash_map::iterator it = c1.lower_bound(L'a');
System::Console::WriteLine("*lower_bound(L'a') = [{0} {1}]",
it->first, it->second);
it = c1.lower_bound(L'b');
System::Console::WriteLine("*lower_bound(L'b') = [{0} {1}]",
it->first, it->second);
return (0);
}
[a 1] [b 2] [c 3] lower_bound(L'x')==end() = True *lower_bound(L'a') = [a 1] *lower_bound(L'b') = [b 2]
Requirements
Header: <cliext/hash_map>
Namespace: cliext