function transform(a_begin, a_end, a1_begin, negate()): a_begin = lower bound of the array. a_end = upper bound of the array. a1_end = Lower bound of the second modified array. negate() = to negate the values of the array.
The logical negation operator ( ! ) reverses the meaning of its operand. The operand must be of arithmetic or pointer type (or an expression that evaluates to arithmetic or pointer type). The operand is implicitly converted to type bool .
While (- v) will negate the elements and return the modified vector without the need for a temporary, it breaks mathematical conventions by effectively setting: v = - v; If that's your goal, then use the negate function.

# std::negate

Defined in header `<functional>`
```template< class T >
struct negate;```
(until C++14)
```template< class T = void >
struct negate;```
(since C++14)

Function object for performing negation. Effectively calls `operator-` on an instance of type `T`.

### Specializations

The standard library provides a specialization of `std::negate` when `T` is not specified, which leaves the parameter types and return type to be deduced.

 negate (C++14) function object implementing `-x` deducing argument and return types (class template specialization)
(since C++14)

### Member types

Type Definition
`result_type`(deprecated in C++17)(removed in C++20) `T`
`argument_type`(deprecated in C++17)(removed in C++20) `T`
 These member types are obtained via publicly inheriting `std::unary_function`. (until C++11)

### Member functions

 operator() returns the negation of the argument (public member function)

## std::negate::operator()

 `T operator()( const T& arg ) const;` (until C++14) `constexpr T operator()( const T& arg ) const;` (since C++14)

Returns the negation of `arg`.

### Parameters

 arg - value to compute negation of

### Return value

The result of `-arg`.

### Exceptions

May throw implementation-defined exceptions.

### Possible implementation

 ```constexpr T operator()(const T &arg) const { return -arg; }```
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