34 lines
807 B
C++
34 lines
807 B
C++
//
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// Created by light on 19-11-4.
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//
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#include <iostream>
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using namespace std;
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void print(const char *s) {
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while (*s) {
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if (*s == '%' && *(++s) != '%')
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throw std::runtime_error("invalid format string: missing arguments");
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std::cout << *s++;
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}
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}
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template<typename T, typename... Args>
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void print(const char *s, T value, Args... args) {
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while (*s) {
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if (*s == '%' && *(++s) != '%') {
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std::cout << value;
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print(++s, args...); // 即便当 *s == 0 也会产生调用，以检测更多的类型参数。
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return;
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}
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std::cout << *s++;
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}
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throw std::logic_error("extra arguments provided to printf");
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}
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int main() {
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int *pi = new int;
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print("%d %s %p %f\n", 15, "Acc", pi, 3.14);
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return 0;
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} |