An expression of the form (e1 op1 ... op2 e2) where op1 and op2 are fold-operators is called a binary fold. In a binary fold, op1 and op2 shall be the same fold-operator, and either e1 shall contain an unexpanded parameter pack or e2 shall contain an unexpanded parameter pack, but not both. If e2 contains an unexpanded parameter pack, the expression is called a binary left fold. If e1 contains an unexpanded parameter pack, the expression is called a binary right fold. [ Example:
template<typename ...Args>
bool f(Args ...args) {
return (true && ... && args); }
template<typename ...Args>
bool f(Args ...args) {
return (args + ... + args); }
— end example ]
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