In the while statement the substatement is executed repeatedly until the value of the condition ([stmt.select]) becomes false. The test takes place before each execution of the substatement.
When the condition of a while statement is a declaration, the scope of the variable that is declared extends from its point of declaration ([basic.scope.pdecl]) to the end of the while statement. A while statement of the form
while (T t = x) statement
is equivalent to
label:{ T t = x;
if (t) {
statement
goto label;
}
}
The variable created in a condition is destroyed and created with each iteration of the loop. [ Example:
struct A {
int val;
A(int i) : val(i) { }
~A() { }
operator bool() { return val != 0; }
};
int i = 1;
while (A a = i) {
i = 0;
}
In the while-loop, the constructor and destructor are each called twice, once for the condition that succeeds and once for the condition that fails. — end example ]
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