wstring - 比较 std::wstring 类型并表示 ChaiScript 中的 wstring 文字

Question

我想像下面的 c++ 代码一样使用 std::wstring 类型编写 ChaiScript 代码。

#include <iostream>

int testfunc(std::wstring s, std::wstring t)
{
    if(s==t)
    {
        std::cout << "1" << std::endl;
    }

    if(s[1]==t[1])
    {
        std::cout << "2" << std::endl;
    }

    if(s==L"aaaa")
    {
        std::cout << "3" << std::endl;
    }

    if(s[1]==L'b')
    {
        std::cout << "4" << std::endl;
    }

    return 5;
}

int main()
{
    std::cout << testfunc(std::wstring(L"abcd"), std::wstring(L"abbb"));

    return 0;
}

D:\TestWork\test_chaiscript>t6
2
4
5

比较 std::wstring 类型的实例是好的。

#include <iostream>
#include <chaiscript/chaiscript.hpp>
#include <chaiscript/chaiscript_stdlib.hpp>
#include <chaiscript/dispatchkit/bootstrap_stl.hpp>

int main()
{
    chaiscript::ChaiScript chai(chaiscript::Std_Lib::library());

    chai.add(chaiscript::bootstrap::standard_library::string_type<std::wstring>("wstring"));

    std::cout << chai.eval<std::function<int (std::wstring, std::wstring)> >(
        "fun(s, t){"
        "   if(s==t){"
        "       print(\"1\");"
        "   }"
        "   return 3;"
        "}"
    )(std::wstring(L"abcd"), std::wstring(L"abaa"));

    return 0;
}

D:\TestWork\test_chaiscript>t5
3

比较 wchar_t 类型的实例是行不通的。

是否必须添加比较运算符方法？

        "   if(s[1]==t[1]){"
        "       print(\"2\");"
        "   }"

D:\TestWork\test_chaiscript>t5
terminate called after throwing an instance of 'chaiscript::exception::eval_error'
  what():  Error: "Error with numeric operator calling: =="

将 std::wstring 类型的实例与字符串类型的文字进行比较是行不通的。无法输入wstring类型的文字。

是否可以在ChaiScript中输入wstring类型的文字？

        "   if(s==\"aaaa\"){"
        "       print(\"2\");"
        "   }"

D:\TestWork\test_chaiscript>t5
terminate called after throwing an instance of 'chaiscript::exception::eval_error'
  what():  Error: "Can not find appropriate '==' operator." With parameters: (wstring, const string)

将 wchar_t 类型的实例与 wchar_t 类型的文字进行比较是行不通的。我无法输入 wchat_t 类型的文字。

是否可以在ChaiScript中输入wchat_t类型的文字？

        "   if(s[1]=='b'){"
        "       print(\"2\");"
        "   }"

D:\TestWork\test_chaiscript>t5
terminate called after throwing an instance of 'chaiscript::exception::eval_error'
  what():  Error: "Error with numeric operator calling: =="

Answer 1

是的，您需要告诉 ChaiScript 一些关于 wchar_t 的信息，例如 == 运算符。例如:

chai.add(
  chaiscript::fun<bool (wchar_t, wchar_t)>(
    [](wchar_t lhs, wchar_t rhs) { return lhs == rhs; }
  ), "=="
);