20
Library introduction
[library]
20.3
Definitions
[definitions]
20.3.21
required behavior
[defns.required.behavior]
a description of
replacement function
and
handler function
semantics applicable to both the behavior provided by the implementation and the behavior of any such function definition in the program
[
Note
:
If such a function defined in a C++ program fails to meet the required behavior when it executes, the behavior is undefined
.
—
end note
]