heroboy schrieb:

hello everyone,     what's the difference between "tuple<int> t;"  and  " tuple<int> t();"

"tuple<int> t;" creates an instance of the type tuple<int>. "tuple<int> t();" declares a function t() with return type tuple<int>. If the constructor takes no argument you must create the instance without the brackets or the compiler takes it as a function declaration

why tuple<int> t; cout<

the linker can't find the definition of the function "tuple<int> t()"

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