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Lets say i have following code:
std::vector<T> R;
if (condition) R = generate();
...
for (int i = 0; i < N; ++i) {
const auto &r = (R.empty() ? generate() : R);
}
It appears that generate is called regardless of R.empty(). Is that standard behavior?
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The ternary operator take three arguments: The first is a comparison argument. The second is the result upon a true comparison. The third is the result upon a false comparison.
The conditional (ternary) operator is the only JavaScript operator that takes three operands: a condition followed by a question mark ( ? ), then an expression to execute if the condition is truthy followed by a colon ( : ), and finally the expression to execute if the condition is falsy.
Remarks. The conditional operator (? :) is a ternary operator (it takes three operands).
Example: C Ternary Operator printf("You can vote") - expression1 that is executed if condition is true. printf("You cannot vote") - expression2 that is executed if condition is false.
From Paragraph 5.16/1 of the C++ 11 Standard:
Conditional expressions group right-to-left. The first expression is contextually converted to bool (Clause 4). It is evaluated and if it is true, the result of the conditional expression is the value of the second expression, otherwise that of the third expression. Only one of the second and third expressions is evaluated. Every value computation and side effect associated with the first expression is sequenced before every value computation and side effect associated with the second or third expression.
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