check file exist cpp

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showing results for - "check file exist cpp"
Francesca
30 Nov 2016
1#include <sys/stat.h>
2#include <unistd.h>
3#include <string>
4#include <fstream>
5
6inline bool exists_test0 (const std::string& name) {
7    ifstream f(name.c_str());
8    return f.good();
9}
10
11inline bool exists_test1 (const std::string& name) {
12    if (FILE *file = fopen(name.c_str(), "r")) {
13        fclose(file);
14        return true;
15    } else {
16        return false;
17    }   
18}
19
20inline bool exists_test2 (const std::string& name) {
21    return ( access( name.c_str(), F_OK ) != -1 );
22}
23
24inline bool exists_test3 (const std::string& name) {
25  struct stat buffer;   
26  return (stat (name.c_str(), &buffer) == 0); 
27}
28
source
Maria José
16 Feb 2020
1Method exists_test0 (ifstream): **0.485s**
2Method exists_test1 (FILE fopen): **0.302s**
3Method exists_test2 (posix access()): **0.202s**
4Method exists_test3 (posix stat()): **0.134s**
5
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