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Update RAII.md

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This commit is contained in:
Francis
2022-04-10 17:36:44 +08:00
committed by GitHub
parent 03ee450eef
commit 70fb25143f
1 changed files with 6 additions and 6 deletions
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10
codingStyleIdioms/3_RAII/RAII.md
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@@ -66,7 +66,7 @@ vector<string> read_lines_from_file(string &file_name) {
string line;
ifstream file_handle (file_name.c_str());
while (file_handle.good() && !file_handle.eof()) {
while (file_handle.good() && !file_handle.eof() && file_handle.peek()!=EOF) {
getline(file_handle, line);
lines.push_back(line);
}
@@ -89,7 +89,7 @@ int main(int argc, char* argv[]) {
输出：
```cpp
File makefile contains 38 lines.
File makefile contains 37 lines.
```
这看起来很简单。`vector`被填满、返回和调用。然而，作为关心性能的高效程序员，这方面的一些问题困扰着我们:在return语句中，由于使用了值语义，`vector`在销毁之前不久就被复制到一个新`vector`中。
@@ -104,7 +104,7 @@ vector<string> * read_lines_from_file(string &file_name) {
string line;
ifstream file_handle (file_name.c_str());
while (file_handle.good() && !file_handle.eof()) {
while (file_handle.good() && !file_handle.eof() && file_handle.peek()!=EOF) {
getline(file_handle, line);
lines->push_back(line);
}
@@ -147,7 +147,7 @@ vector<string> * read_lines_from_file(string &file_name) {
string line;
ifstream file_handle (file_name.c_str());
while (file_handle.good() && !file_handle.eof()) {
while (file_handle.good() && !file_handle.eof() && file_handle.peek()!=EOF) {
getline(file_handle, line);
lines->push_back(line);
}
@@ -265,7 +265,7 @@ unique_ptr<vector<string>> read_lines_from_file(string &file_name) {
string line;
ifstream file_handle (file_name.c_str());
while (file_handle.good() && !file_handle.eof()) {
while (file_handle.good() && !file_handle.eof() && file_handle.peek()!=EOF) {
getline(file_handle, line);
lines->push_back(line);
}