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  1. #include <iostream>
  2. #include <stdarg.h>
  3. #include <string>
  4. #include <vector>
  5.  
  6. std::string string_format(const char *fmt, ...) {
  7.     std::vector<char> str(100);
  8.     va_list ap;
  9.     while (1) {
  10.         va_start(ap, fmt);
  11.         int n = vsnprintf(&str[0], str.size(), fmt, ap);
  12.         va_end(ap);
  13.         if (n > -1 && n < str.size()) {
  14.             str.resize(n);
  15.             return &str[0];
  16.         }
  17.         str.resize(str.size() * 2);
  18.     }
  19. }
  20.  
  21. int main() {
  22.   std::cout << string_format("%s %s!\n", "Hello", "World");
  23.   return 0;
  24. }
Success #stdin #stdout 0.01s 2812KB
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stdin
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Standard input is empty
stdout
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Hello World!
https://ideone.com/23xIY
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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