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#include <stdexcept>
#include <iostream>
template<typename ...Params>
void xprintf(std::string const &strFormat, Params ...parameters);
void xprintf(char const *s)
{
while (*s)
{
if (*s == '%' && *(++s) != '%')
throw std::runtime_error(
"invalid format string: missing arguments");
std::cout << *s++;
}
}
template<typename T, typename ...Args> // 1
void xprintf(const char* s, T value, Args ...args) // 2
{
while (*s)
{
if (*s == '%' && *(++s) != '%') // 6
{
std::cout << value; // 8
xprintf(*s ? ++s : s, args...); // 9
return;
}
std::cout << *s++;
}
throw std::logic_error("extra arguments provided to printf");
}
int main()
{
xprintf("hello %x worlds\n", 5);
}
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