Removes min(count, size() - index) characters starting at index

BOOST_STATIC_STRING_CPP14_CONSTEXPR basic_static_string&
erase(
    size_type index = 0,
    size_type count = npos);
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Removes the character at pos

BOOST_STATIC_STRING_CPP14_CONSTEXPR iterator
erase(
    const_iterator pos);
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Removes the characters in the range (first, last)

BOOST_STATIC_STRING_CPP14_CONSTEXPR iterator
erase(
    const_iterator first,
    const_iterator last);
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