C++17 introduces [[nodiscard]] attribute to let the compiler deduce that the return value of a function or method must be handled by a properly assigned value. The attribute simply produces compilation warning when the flagged function is invoked with its return value bypassed.

#include <cstring>
[[nodiscard ( Deallocate the char* in callers scope using
             delete[]!")]]
char getLog() {
     char* log
     new char[100];
     strcpy(log, "[INFO]: Hello World!");
     return log;
}

int main() {
    getLog(); // ERROR: attribute produces
             // compile time warning
    auto log = getLog(); // OK
    delete[] log;
    return 0;
}