In VC++, when I typecast theconst char*value returned bystd::string::c_str()tochar*and print the casted value, nothing gets printed on the screen. Here is the code snippet #include"stdafx.h"#include<string>usingnamespacestd;stringtest(){return(string("HELLO"));}int_tmain(intargc, _...
是一个字符指针(char*)赋给了一个字符型(char)变量,导致报错。例如:string s = "abc";char* c = s.c_str();这时会报错:invalid conversion from `const char*' to `char*'解决方法: char* c = const_cast<char *>(s.c_str());...
structCallback{intcontext;voidInvoke(inta,doubleb,constchar*c){cout<<context<<","<<a<<","<<b<<","<<c<<endl;}};intmain(){Callbackcallback{200};Fuck(CALLBACK(&callback,Invoke));return0;} C++需要不断地练习。
您应该使用reinterpret_cast<char *>而不是static_cast<char *>,因为数据类型不相关:例如,您可以在指向子类的指针与超类之间转换,或者在int之间转换和long,或void *与任何指针之间,但unsigned int *到char *不是“安全”,因此您无法使用static_cast。< / p> 不同之处在于,在C ++中,您有各种类型的强制转换:...
比如int转换为float,char转变为short,很多时候我们都“默认”了这种转换,即使没有显式指定用旧式转换还是static_cast。在这种类型的转换中,旧式转换和static_cast的表现非常地类似: double dVal = 5.0 ; char cVal = static_cast < char > (dVal);
if you have a function that takes a parameter of a const char *, and you pass in a modifiable char *, it's safe to const_cast that parameter back to a char * and modify it. However, if the original variable was in fact const, then using const_cast will result in undefined behavio...
const_cast<char *>(a) 是c++中的语法。 将a转为 char* 类型。 const_cast 表示将a转化为非常量指针 多用来修饰 const属性的 (char*)a 表示将a转化为 char*类型 没有别的含义。
②用于基本数据类型之间的转换,如把int转换成char,把int转换成enum。这种转换的安全性也要开发人员来保证。 ③把空指针转换成目标类型的空指针。 ④把任何类型的表达式转换成void类型。 注意:static_cast不能转换掉exdivssion的const、volitale、或者__unaligned属性。
* a pointer to member expressed as described in 5.3.1; or * a constant expression of typestd::nullptr_t. In your example,string<'c', 'i', 'a', 'o', '\0'>{}is none of those. Note that the first bullet is restricted to integral or enumeration type, andconst char*is neither ...
const_cast is safe onlyifyou're casting a variable that was originally non-const. For example, if you have a function that takes a parameter of a const char *, and you pass in a modifiable char *, it's safe to const_cast that parameter back to a char*and modify it.However,ifthe...