A function or function object that returns a value testable as true
Negators, unary_negate, binary_negate, Operators, greater, less, greater_equal, less_equal, logical_and, logical_or, logical_not, binary_function, unary_function, plus, minus, multiplies, divides, modulus
ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25 -7-
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Licensed under the Apache License, Version 2.0.
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