Erase (in-place) all the elements from the specified str where the specified pred returns true, and return the number of erased elements.
Declared in <bslstl_string.h>
template<
class CHAR_TYPE,
class CHAR_TRAITS,
class ALLOCATOR,
class UNARY_PREDICATE>
bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>::size_type
erase_if(
basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>& str,
UNARY_PREDICATE const& pred);