文章目录
示例代码
#include
using namespace std;
typedef enum {
NULL,
} TYPE;
int main()
{
ostrstream a;
TYPE c = NULL;
a<<c;
return 0;
}
解释
这个警告的原因是，strstream类在做输出的时候，选择了一个转换的重载函数，会将 unsigned int 类型转换成带符号的int。这样其实是比较危险的操作。如果只是一个打印语句，也行无所谓。
Wsign-promo
-Wsign-promo (C++ and Objective-C++ only)
Warn when overload resolution chooses a promotion from unsigned or enumerated type to a signed type, over a conversion to an unsigned type of the same size. Previous versions of G++ tried to preserve unsignedness, but the standard mandates the current behavior.
解决
强制转换：// a << (int) c;
Original: https://blog.csdn.net/qq_36428903/article/details/128715152
Author: mzhan017
Title: C++: warning: passing ‘A’ chooses ‘int’ over ‘unsigned int’ [-Wsign-promo]
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