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如何创建一个正常运行的向量<wchar_t>有一个擦除(size_t pos)方法?</wchar_t>

[英]how do I create a functioning vector<wchar_t> that has an erase(size_t pos) method?

I am creating a C++ wstring class for use with mingw version 4.3.0, cross-compiling for Win32.我正在创建一个 C++ wstring class 用于 mingw 版本 4.3.0,用于 Win32 的交叉编译。 I want my string to work like std::string which means that I want an erase(int pos) method that erases a single element at position pos .我希望我的字符串像std::string一样工作,这意味着我想要一个擦除 position pos处的单个元素的erase(int pos)方法。

Here is my first attempt:这是我的第一次尝试:

#include <wchar.h>
#include <iostream>
#include <vector>

class wstring : public std::vector<wchar_t>{
public:
    void erase(size_t where){
    erase(begin()+where);
    }
};

int main(int argc,char **argv) {
    wstring c1;
    c1.push_back(L'a');
    c1.push_back(L'b');
    c1.push_back(L'c');
    c1.erase(1);

    for(size_t i = 0;i<c1.size();i++){
    std::cout << "c1[" << i << "] = " << c1[i] << "\n";
    }
    return 0;
}

This looks like it should work to me, but I get this wacko compiler error when I try to compile it:这看起来应该对我有用,但是当我尝试编译它时,我得到了这个 wacko 编译器错误:

$ i386-mingw32-g++ x1.cpp
x1.cpp: In member function 'void wstring::erase(size_t)':
x1.cpp:8: error: no matching function for call to 'wstring::erase(__gnu_cxx::__normal_iterator<wchar_t*, std::vector<wchar_t, std::allocator<wchar_t> > >)'
x1.cpp:7: note: candidates are: void wstring::erase(size_t)
$ 

What's really weird is that if I take out the erase method and just inline the code, I have no problem:真正奇怪的是,如果我取出erase方法,只是内联代码,我没有问题:

#include <wchar.h>
#include <iostream>
#include <vector>

class wstring : public std::vector<wchar_t>{
};

int main(int argc,char **argv) {
    wstring c1;
    c1.push_back(L'a');
    c1.push_back(L'b');
    c1.push_back(L'c');
    c1.erase(c1.begin()+1);

    for(size_t i = 0;i<c1.size();i++){
    std::cout << "c1[" << i << "] = " << c1[i] << "\n";
    }
    return 0;
}

I'm mystified.我很迷惑。

The answer to your particular question is to use std::vector<T>::erase( iterator ) instead of remove :您的特定问题的答案是使用std::vector<T>::erase( iterator )而不是remove

std::vector<int> v;
v.push_back( 1 );
v.push_back( 2 );
v.push_back( 3 );
v.erase( v.begin()+1 ); // equivalent to v.remove( 1 )

But I don't think that you are barking at the right tree.但我不认为你在正确的树上吠叫。 There is already a std::wstring in the standard library that is the instantiation of basic_string with wchar_t , and that will get as close as it can to std::string (which is an instantiation of the same template with char )标准库中已经有一个std::wstringbasic_stringwchar_t的实例化,它将尽可能接近std::string (这是与char相同模板的实例化)

You could always just use the existing type std::wstring , which is a typedef for std::basic_string<wchar_t> .您总是可以只使用现有类型std::wstring ,它是std::basic_string<wchar_t>的 typedef。 Feel free to make other string classes based on your favourite integral types, too.也可以根据您最喜欢的整数类型随意创建其他字符串类。

Note that there are corresponding stream objects std::wcout etc.请注意,有相应的 stream 对象std::wcout等。

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