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                # error: cast from ... to ... loses precision ## 例子 #include <iostream> class Foo { public: void print() const { std::cout << (int)(this) << "\n"; } }; int main() { class Foo foo; foo.print(); return 0; } ## 技巧 在g++編譯上面的例子,會報如下錯誤: $ g++ foo.cc foo.cc: In member function ‘void Foo::print() const’: foo.cc:6:28: error: cast from ‘const Foo*’ to ‘int’ loses precision [-fpermissive] 這是一個強制類型轉換的錯誤,你可以修改源代碼為: std::cout << (int*)(this) << "\n"; 即可。 如果,你不想(或不能)去修改源程序,只是應為升級了gcc而帶來了這樣的錯誤,那么也可以使用`-fpermissive`選項,將錯誤降低為警告: $ g++ foo.cc -fpermissive foo.cc: In member function ‘void Foo::print() const’: foo.cc:6:28: warning: cast from ‘const Foo*’ to ‘int’ loses precision [-fpermissive] 詳情參見[gcc手冊](https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Dialect-Options.html#index-fpermissive-166) ## 貢獻者 xmj
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