# operator==,!=,<,<=,>,>=(std::basic_string_view)

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< cpp‎ | string‎ | basic string view

Defined in header `<string_view>` |  |
template< class CharT, class Traits > constexpr bool operator==( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (1) | (since C++17)
template< class CharT, class Traits > constexpr bool operator!=( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (2) | (since C++17)
template< class CharT, class Traits > constexpr bool operator<( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (3) | (since C++17)
template< class CharT, class Traits > constexpr bool operator<=( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (4) | (since C++17)
template< class CharT, class Traits > constexpr bool operator>( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (5) | (since C++17)
template< class CharT, class Traits > constexpr bool operator>=( basic_string_view <CharT,Traits> lhs, basic_string_view <CharT,Traits> rhs ) noexcept; | (6) | (since C++17)

Compares two views.

All comparisons are done via the compare() member function (which itself is defined in terms of `Traits::compare()`):

- Two views are equal if both the size of `lhs` and `rhs` are equal and each character in `lhs` has an equivalent character in `rhs` at the same position.

- The ordering comparisons are done lexicographically -- the comparison is performed by a function equivalent to std::lexicographical_compare.

The implementation shall provide sufficient additional `constexpr` and `noexcept` overloads of these functions so that a `basic_string_view<CharT,Traits>` object `sv` may be compared to another object `t` with an implicit conversion to `basic_string_view<CharT,Traits>`, with semantics identical to comparing `sv` and `basic_string_view<CharT,Traits>(t)`.

### Parameters

lhs, rhs | - | views to compare

### Return value

true if the corresponding comparison holds, false otherwise.

### Complexity

Linear in the size of the views.

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