C++ “警告：在 g++ 中使用旧式强制转换”
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"warning: use of old-style cast" in g++
提问by prosseek
Possible Duplicate:
When should static_cast, dynamic_cast and reinterpret_cast be used?
With this C++ code,
有了这个 C++ 代码，
char* a = (char*) b;
I got warning warning: use of old-style cast.
我收到警告warning: use of old-style cast。
What would be the new-style cast?
新风格的演员阵容是什么？
回答by Erik
reinterpret_cast, static_cast, dynamic_castand const_castare the c++ cast alternatives.
reinterpret_cast，static_cast，dynamic_cast并且const_cast是C ++投的替代品。
const_castto remove const/volatile from a const variable.dynamic_castto perform runtime validity checks when casting in between polymorphic typesstatic_castto perform e.g up/down-cast in a inheritance hierarchy, but with no runtime checks, or to explicitly perform conversions that could be implicit (e.g. float to int)reinterpret_castto convert in between unrelated types.
const_cast从 const 变量中删除 const/volatile。dynamic_cast在多态类型之间进行转换时执行运行时有效性检查static_cast在继承层次结构中执行例如向上/向下转换，但没有运行时检查，或者显式执行可能是隐式的转换（例如浮点到 int）reinterpret_cast在不相关的类型之间进行转换。
Brief syntax example:
简要语法示例：
char* a = (char*) b;
//would be
char* a = static_cast<char*>(b);
//to remove the warning
回答by Nawaz
Read this topic to know about C++ style casts which come in various flavors:
阅读本主题以了解各种风格的 C++ 风格强制转换：
When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?
什么时候应该使用 static_cast、dynamic_cast、const_cast 和 reinterpret_cast？
