Defined in adapters.hpp.
This type should be a stateless trivially default constructible with a call operator of signature bool operator()(Value const&, Value const&) (possibly noexcept, inline and/or constexpr also) for use with, for example, std::unordered_map.
| Value | the type of objects to compare. | 
The second template parameter exists for SFINAE.
| Public Member Functions | |
| bool | operator() (Value const &x, Value const &y) const | 
| Compare xandywith std::equal_to. | |
| 
 | inline | 
This call operator compares x and y using std::equal_to with template parameter Value.
| x | const reference to Valueto compare withy. | 
| y | const reference to Valueto compare withx. | 
bool.