Remove outdated string function wrapper for Android and Caffe2 (pytor…

…ch#116186)

Pull Request resolved: pytorch#116186
Approved by: https://github.com/janeyx99

c10/util/string_utils.h

@@ -1,142 +1,13 @@
 #pragma once
 
-#include <sstream>
-#include <stdexcept>
 #include <string>
 
 namespace c10 {
 
-// to_string, stoi and stod implementation for Android related stuff.
-// Note(jiayq): Do not use the CAFFE2_TESTONLY_FORCE_STD_STRING_TEST macro
-// outside testing code that lives under common_test.cc
-#if defined(__ANDROID__) || defined(CAFFE2_TESTONLY_FORCE_STD_STRING_TEST)
-#define CAFFE2_TESTONLY_WE_ARE_USING_CUSTOM_STRING_FUNCTIONS 1
-template <typename T>
-std::string to_string(T value) {
-  std::ostringstream os;
-  os << value;
-  return os.str();
-}
-
-inline int stoi(const std::string& str, std::size_t* pos = 0) {
-  std::stringstream ss;
-  int n = 0;
-  ss << str;
-  ss >> n;
-  if (ss.fail()) {
-    // To mimic `std::stoi` and to avoid including `Exception.h`, throw
-    // `std::invalid_argument`.
-    // We can't easily detect out-of-range, so we don't use `std::out_of_range`.
-    throw std::invalid_argument("Not an integer");
-  }
-  if (pos) {
-    if (ss.tellg() == std::streampos(-1)) {
-      *pos = str.size();
-    } else {
-      *pos = ss.tellg();
-    }
-  }
-  return n;
-}
-
-inline uint64_t stoull(const std::string& str) {
-  std::stringstream ss;
-  uint64_t n = 0;
-  ss << str;
-  ss >> n;
-  if (ss.fail()) {
-    // To mimic `std::stoull` and to avoid including `Exception.h`, throw
-    // `std::invalid_argument`.
-    // We can't easily detect out-of-range, so we don't use `std::out_of_range`.
-    throw std::invalid_argument("Not an unsigned 64-bit integer");
-  }
-  return n;
-}
-
-inline double stod(const std::string& str, std::size_t* pos = 0) {
-  std::stringstream ss;
-  ss << str;
-  double val = 0;
-  ss >> val;
-  if (ss.fail()) {
-    // To mimic `std::stod` and to avoid including `Exception.h`, throw
-    // `std::invalid_argument`.
-    // We can't easily detect out-of-range, so we don't use `std::out_of_range`.
-    throw std::invalid_argument("Not a double-precision floating point number");
-  }
-  if (pos) {
-    if (ss.tellg() == std::streampos(-1)) {
-      *pos = str.size();
-    } else {
-      *pos = ss.tellg();
-    }
-  }
-  return val;
-}
-
-inline long long stoll(const std::string& str, std::size_t* pos = 0) {
-  // std::stoll doesn't exist in our Android environment, we need to implement
-  // it ourselves.
-  std::stringstream ss;
-  ss << str;
-  long long result = 0;
-  ss >> result;
-  if (ss.fail()) {
-    // To mimic `std::stoll` and to avoid including `Exception.h`, throw
-    // `std::invalid_argument`.
-    // We can't easily detect out-of-range, so we don't use `std::out_of_range`.
-    throw std::invalid_argument("Not a long long integer");
-  }
-  if (pos) {
-    if (ss.tellg() == std::streampos(-1)) {
-      *pos = str.size();
-    } else {
-      *pos = ss.tellg();
-    }
-  }
-  return result;
-}
-
-inline long long stoll(const std::string& str, size_t pos, int base) {
-  // std::stoll doesn't exist in our Android environment, we need to implement
-  // it ourselves.
-  std::stringstream ss;
-  if (str.size() > 0 && str.at(0) == '0') {
-    if (str.size() > 1 && (str.at(1) == 'x' || str.at(1) == 'X')) {
-      ss << std::hex << str;
-    } else {
-      ss << std::oct << str;
-    }
-  } else {
-    ss << str;
-  }
-  long long result = 0;
-  ss >> result;
-  if (ss.fail()) {
-    // To mimic `std::stoll` and to avoid including `Exception.h`, throw
-    // `std::invalid_argument`.
-    // We can't easily detect out-of-range, so we don't use `std::out_of_range`.
-    throw std::invalid_argument("Not a long long integer");
-  }
-  return result;
-}
-
-#else
-#define CAFFE2_TESTONLY_WE_ARE_USING_CUSTOM_STRING_FUNCTIONS 0
 using std::stod;
 using std::stoi;
 using std::stoll;
 using std::stoull;
 using std::to_string;
-#endif // defined(__ANDROID__) || defined(CAFFE2_FORCE_STD_STRING_FALLBACK_TEST)
 
 } // namespace c10
-
-#if defined(__ANDROID__) && __ANDROID_API__ < 21 && defined(__GLIBCXX__)
-#include <cstdlib>
-// std::strtoll isn't available on Android NDK platform < 21 when building
-// with libstdc++, so bring the global version into std.
-namespace std {
-using ::strtoll;
-}
-#endif