1
我想在我的代码中的二进制文本数组作为文字。这些消息非常小,所以我认为使用'二进制'文字最容易。但怎么做呢?如何创建一个二进制文字数组
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 } }
};
与Visual Studio 2013 C++编译器,我得到错误:
error C2440: 'initializing' : cannot convert from 'initializer-list' to 'binary_message'. No constructor could take the source type, or constructor overload resolution was ambiguous
使用g ++我得到:
>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?
UPDATE
我想你的意思是这样的吗?
#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;
}
二进制文字是C++ 14的实际东西,看起来像'0b100110' - 如果这不是你的意思,你应该澄清你想要做什么。 – melak47
您正在使用十进制文字(如“3”)和十六进制文字(如“0x3”)的组合。但是,无论您将这些整数值表示为十进制,十六进制,八进制还是二进制等,它们仍然只是编译器的编号。在运行时没有与该表示相对应的优化。 –
使用'const',你可以做一些像'“\ x01 \ x02 \ x03”' – Jarod42