Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Equality operator.

bool
operator==(
    const rows& lhs,
    const rows& rhs);

The containers are considered equal if they have the same number of rows and they all compare equal, as defined by row_view::operator==.

No-throw guarantee.

Linear in lhs.size() * lhs.num_columns() and rhs.size() * rhs.num_columns().