Question

我希望代码中的二进制消息数组为文字。消息非常小，所以我认为使用'二进制'文字最容易。但是怎么做呢？

我试过这段代码：

struct binary_message
{
    binary_message(int size, unsigned char* bytes) : size_(size), bytes_(bytes) {}
    int size_;
    unsigned char* bytes_;
};

binary_message messages[] = {
    { 3, { 0x1, 0x2, 0x3 } },
    { 2, { 0x1, 0x2 } },
    { 1, { 0x1 } }
};

使用Visual Studio 2013 C ++编译器

我收到错误：

error C2440: 'initializing' : cannot convert from 'initializer-list' to 'binary_message'. No constructor could take the source type, or constructor overload resolution was ambiguous

用g ++我得到了：

>g++ main.cpp
main.cpp:13:1: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x [enabled by default]
main.cpp:13:1: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x [enabled by default]
main.cpp:13:1: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x [enabled by default]
main.cpp:13:1: error: could not convert '{3, {1, 2, 3}}' from '<brace-enclosed initializer list>' to 'binary_message'
main.cpp:13:1: error: could not convert '{2, {1, 2}}' from '<brace-enclosed initializer list>' to 'binary_message'
main.cpp:13:1: error: invalid conversion from 'int' to 'unsigned char*' [-fpermissive]
main.cpp:4:2: error:   initializing argument 2 of 'binary_message::binary_message(int, unsigned char*)' [-fpermissive]

如果我使用g ++ -std = c ++ 0x main.cpp我仍然得到：

main.cpp:13:1: error: could not convert '{3, {1, 2, 3}}' from '<brace-enclosed initializer list>' to 'binary_message'
main.cpp:13:1: error: could not convert '{2, {1, 2}}' from '<brace-enclosed initializer list>' to 'binary_message'
main.cpp:13:1: error: invalid conversion from 'int' to 'unsigned char*' [-fpermissive]
main.cpp:4:2: error:   initializing argument 2 of 'binary_message::binary_message(int, unsigned char*)' [-fpermissive]

我该如何解决这个问题？

更新

我猜你的意思是这样的？

#include <vector>
#include <iostream>

struct binary_message
{
    binary_message(std::initializer_list<unsigned char> data) : bytes_(data) {}
    std::vector<unsigned char> bytes_;
};

int main()
{
    binary_message messages[] = {
            { 0x1, 0x2, 0x3 },
            { 0x1, 0x2 },
            { 0x1 }
    };

    binary_message msg1 = messages[0];

    return 0;
}

Answer 1

如果要使用初始化列表构建对象，则需要初始化列表构造函数。您当前的构造函数接受缓冲区和缓冲区的大小，但{ 3, { 0x1, 0x2, 0x3 } }不是那样的 - 它是数字和初始化列表的初始化列表。

要正确使用初始化程序列表，您的类和构造函数应该大致如下：

binary_message( std::initializer_list<int> data) : data(data) {}
...
std::vector<int> data;

你根本不会使用size - 矢量的大小会告诉你。

如何创建二进制文字数组

1 个答案: