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book: improve NULL example (#133)

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This commit is contained in:
sunshaoce
2020-10-03 15:27:14 +08:00
committed by GitHub
parent 212f4f3503
commit c9f8eb70fd
3 changed files with 123 additions and 120 deletions
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7
book/zh-cn/02-usability.md
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@@ -43,7 +43,8 @@ void foo(char *);
void foo(int);
int main() {
if (std::is_same<decltype(NULL), decltype(0)>::value)
if (std::is_same<decltype(NULL), decltype(0)>::value ||
std::is_same<decltype(NULL), decltype(0L)>::value)
std::cout << "NULL == 0" << std::endl;
if (std::is_same<decltype(NULL), decltype((void*)0)>::value)
std::cout << "NULL == (void *)0" << std::endl;
@@ -237,7 +238,7 @@ class MagicFoo {
public:
std::vector<int> vec;
MagicFoo(std::initializer_list<int> list) {
for (std::initializer_list<int>::iterator it = list.begin();
for (std::initializer_list<int>::iterator it = list.begin();
it != list.end(); ++it)
vec.push_back(*it);
}
@@ -256,7 +257,7 @@ int main() {
初始化列表除了用在对象构造上，还能将其作为普通函数的形参，例如：
```Cpp
public:
public:
void foo(std::initializer_list<int> list) {
for (std::initializer_list<int>::iterator it = list.begin(); it != list.end(); ++it) vec.push_back(*it);
}