如何解决使用 std::string
我目前正在尝试声明一个由 17 个 std::bitset 组成的数组,每个 32 位长。我是这样做的:
std::bitset<32> mTestInstruction[17]
{
std::string("01000000001000000000000000000001"),std::string("01000000011000000000000001100011"),std::string("01000000101000000000000000000001"),std::string("10100000000000000000000000001010"),std::string("00000000100000010000000010000010"),std::string("00000000110001010010000000000001"),std::string("01001000111001010000000000000000"),std::string("01000100001000110000000000000011"),std::string("01000000001000010000000000000001"),std::string("10000000000000000000000000000011"),std::string("00000000010000000000000000000001"),std::string("00000000111000000000000000000001"),std::string("00000000111001110000100000000001"),std::string("01000000010000100000000000000001"),std::string("01000100001000100000000000000010"),std::string("10000000000000000000000000001100"),std::string("11100000000000000000000000001000"),};
我收到以下错误:
error: Could not convert 'std::__cxx11::basic_string<char>(((const char*)"01000000001000000000000000000001"),std::allocator<char>())' from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'std::bitset<32u>'
对于每个位串。
我不明白为什么会发生这种情况,因为根据 cpp 参考,std::string 是构造位集的有效方法。 谁能指出如何解决这个问题?
解决方法
您需要像这样调用 std::bitset
的构造函数:
std::bitset< 32 > mTestInstruction[17]
{
std::bitset< 32 >( std::string( "01000000001000000000000000000001" ) ),std::bitset< 32 >( std::string( "01000000011000000000000001100011" ) ),// ...
};
甚至更短:
std::bitset< 32 > mTestInstruction[17]
{
std::bitset< 32 >( "01000000001000000000000000000001" ),std::bitset< 32 >( "01000000011000000000000001100011" ),// ...
};
您的代码不起作用的原因是 std::bitset
接受 std::string
的构造函数被标记为显式(请参阅 here)。
从 C++14 开始,您可以使用二进制文字,例如:
std::bitset< 32 > mTestInstruction[17]
{
0b01000000001000000000000000000001,0b01000000011000000000000001100011,// ...
};
,
你可以这样做:
std::bitset<32> mTestInstruction[17]{
std::bitset<32>{std::string("01000000001000000000000000000001")},std::bitset<32>{std::string("01000000011000000000000001100011")},std::bitset<32>{std::string("01000000101000000000000000000001")},std::bitset<32>{std::string("10100000000000000000000000001010")},std::bitset<32>{std::string("00000000100000010000000010000010")},std::bitset<32>{std::string("00000000110001010010000000000001")},std::bitset<32>{std::string("01001000111001010000000000000000")},std::bitset<32>{std::string("01000100001000110000000000000011")},std::bitset<32>{std::string("01000000001000010000000000000001")},std::bitset<32>{std::string("10000000000000000000000000000011")},std::bitset<32>{std::string("00000000010000000000000000000001")},std::bitset<32>{std::string("00000000111000000000000000000001")},std::bitset<32>{std::string("00000000111001110000100000000001")},std::bitset<32>{std::string("01000000010000100000000000000001")},std::bitset<32>{std::string("01000100001000100000000000000010")},std::bitset<32>{std::string("10000000000000000000000000001100")},std::bitset<32>{std::string("11100000000000000000000000001000")},};
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