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book: improve NULL example (#133)

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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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3
book/en-us/02-usability.md
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@@ -53,7 +53,8 @@ void foo(char *);
void foo(int); void foo(int);
int main() { 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; std::cout << "NULL == 0" << std::endl;
if (std::is_same<decltype(NULL), decltype((void*)0)>::value) if (std::is_same<decltype(NULL), decltype((void*)0)>::value)
std::cout << "NULL == (void *)0" << std::endl; std::cout << "NULL == (void *)0" << std::endl;

3
book/zh-cn/02-usability.md
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@@ -43,7 +43,8 @@ void foo(char *);
void foo(int); void foo(int);
int main() { 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; std::cout << "NULL == 0" << std::endl;
if (std::is_same<decltype(NULL), decltype((void*)0)>::value) if (std::is_same<decltype(NULL), decltype((void*)0)>::value)
std::cout << "NULL == (void *)0" << std::endl; std::cout << "NULL == (void *)0" << std::endl;

3
code/2/2.01.nullptr.cpp
View File

@@ -14,7 +14,8 @@ void foo(char *);
void foo(int); void foo(int);
int main() { 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; std::cout << "NULL == 0" << std::endl;
if (std::is_same<decltype(NULL), decltype((void*)0)>::value) if (std::is_same<decltype(NULL), decltype((void*)0)>::value)
std::cout << "NULL == (void *)0" << std::endl; std::cout << "NULL == (void *)0" << std::endl;