Question

有没有办法在编译时使用 C / C ++预处理器（甚至模板元编程）创建字符串哈希？

e.g。 UNIQUE_SALT("HelloWord", 3DES);

这个想法是HelloWorld不会出现在已编译的二进制文件中，只是一个哈希值。

编辑：这些声明中有很多都散布在大型代码库中。

Answer 1

为什么不生成构建过程的哈希部分？您可以编写一个简单的批处理文件来生成哈希（假设您有一个程序来执行此类操作 - 如果没有，请编写一个）并让它输出预处理程序指令，如：

#define MY_HASH 123456789

到.h文件，然后在您的应用程序中获取#included。

Answer 2

使用C ++ 0x，这可以由#1和#2中的答案涵盖。

在C ++ 03中，没有编译时字符串处理。使用预处理器，您无法将字符串分隔为标记，使用模板无法访问单个字符。然而，对推测的approach using C++0x进行了讨论。

你可以为C ++ 03做的是按字符顺序传递字符串（可能使用多字符文字）：

foo = hash<3DES, str<'a','b','c'> >::result;
// or:
foo = hash<3DES, str<'abc','def'> >::result;

...或者只是将其作为预构建步骤。

Answer 3

虽然这不是问题的正确答案，但请参阅此博客条目，以获取最多256个字符的字符串哈希函数示例，该字符串纯粹作为C宏实现：

http://lolengine.net/blog/2011/12/20/cpp-constant-string-hash

以下是博客中的实际代码：

#include <string.h>
#include <stdint.h>
#include <stdio.h>

#define H1(s,i,x)   (x*65599u+(uint8_t)s[(i)<strlen(s)?strlen(s)-1-(i):strlen(s)])
#define H4(s,i,x)   H1(s,i,H1(s,i+1,H1(s,i+2,H1(s,i+3,x))))
#define H16(s,i,x)  H4(s,i,H4(s,i+4,H4(s,i+8,H4(s,i+12,x))))
#define H64(s,i,x)  H16(s,i,H16(s,i+16,H16(s,i+32,H16(s,i+48,x))))
#define H256(s,i,x) H64(s,i,H64(s,i+64,H64(s,i+128,H64(s,i+192,x))))

#define HASH(s)    ((uint32_t)(H256(s,0,0)^(H256(s,0,0)>>16)))

如果您提前知道只将其用于静态字符串，则可以用sizeof（）替换strlen（）。

Answer 4

这可以通过Boost.MPL完成，但它可能不是您所追求的哈希类型。

http://arcticinteractive.com/2009/04/18/compile-time-string-hashing-boost-mpl/

Answer 5

即使使用预处理器无法（合理地）完成此操作，如果您使用字符串文字或将其声明为static const并且未创建任何持久引用，编译器可能会继续执行生成结果的所有数学运算，如果使用优化进行编译，则省略对象文件中的字符串。最困难的部分是你无法使代码初始化一个太复杂的全局变量或静态变量，或者编译器会说“嘿，你！你不知道你不能在函数之外使用for循环？”。

Answer 6

我使用了很好的'ol C ++标准偶然发现了一个解决方案（我不确定它的版本是什么，但我们只是说这个解决方案适用于Visual Studio）。这是链接：link。

此外，这是使用上述技术的JSHash函数的简短版本。此处显示的一个最多支持4个字符，但您可以添加任意数量的字符。

template<const char A = 0, const char B = 0, const char C = 0, const char D = 0>
struct cHash
{
    template<const char C, size_t hash = 1315423911>
    struct HashCalc
    {
        enum { value = (C == 0) ? hash : hash ^ ((hash << 5) + C + (hash >> 2)) };
    };

    enum { value = HashCalc<D,HashCalc<C,HashCalc<B,HashCalc<A>::value>::value>::value>::value };
};

如上所述，因为这是一个编译时哈希，你可以这样做：

namespace Section
{
    enum Enum
    {
        Player = cHash<'p','l','a','y'>::value
    };
}

这不是最优雅的解决方案，所以我打算在这个领域做更多的研究，但是因为这是我在VisualStudio2010中唯一可以工作的东西，就我目前的项目而言，我有点受限制。

Answer 7

声称在编译时无法解析字符串的答案是错误的。在编译时无法解析字符指针，但字符串文字不是字符指针;它们是长度属于类型的字符数组。很容易忘记这一点，因为在大多数情况下让它们腐烂成char *会更有用。但他们并不是那样开始的。

啊，但是如何实际定义一个采用固定长度字符数组的函数，特别是如果我们真的宁愿在任意长度的字符串上使用它？这就是模板参数推导变得非常方便的地方：

template<size_t L>
constexpr int hash(const char (&str)[L], int n = L - 1) {
    // hash goes here. You can define recursively as a
    // function of str[n] and hash(str, n-1). Remember to
    // treat 0 as a special case.
}

这应该让你开始。显然，散列本身需要足够简单以进行编译时计算，但这可能没问题。

Answer 8

这就是我用C ++ 0x编译时编译时字符串哈希的方法：

.de.xlf

用法：

class StringHash
{
public:
    template <unsigned N, unsigned I>
    struct HashHelper
    {
        constexpr static unsigned Calculate(const char (&str)[N])
        {
            return (HashHelper<N, I - 1>::Calculate(str) ^ (str[I - 1] & 0xFF)) * StringHash::PRIME;
        }
    };

    template <unsigned N>
    struct HashHelper<N, 1>
    {
        constexpr static unsigned Calculate(const char (&str)[N])
        {
            return (StringHash::OFFSET ^ (str[0] & 0xFF)) * StringHash::PRIME;
        }
    };

    template<unsigned N>
    constexpr static unsigned StaticHash(const char (&str)[N])
    {
        return HashHelper<N, N>::Calculate(str);
    }

    static const unsigned OFFSET = 0x01234567;
    static const unsigned PRIME = 0x89ABCDEF;
}

Answer 9

answer from michaeljt 对我不起作用，我得到了：

<块引用>

错误 C2131 表达式未计算为常量

相反，我想出了这个，它对我有用（长度最多为 254，只有常量字符数组）：

#define CT 65599u
#define H2(s) (CT * s[0] + s[1])
#define H4(s) (CT * (CT * H2(s) + s[2]) + s[3])
#define H6(s) (CT * (CT * H4(s) + s[4]) + s[5])
#define H8(s) (CT * (CT * H6(s) + s[6]) + s[7])
#define H10(s) (CT * (CT * H8(s) + s[8]) + s[9])
#define H12(s) (CT * (CT * H10(s) + s[10]) + s[11])
#define H14(s) (CT * (CT * H12(s) + s[12]) + s[13])
#define H16(s) (CT * (CT * H14(s) + s[14]) + s[15])
#define H18(s) (CT * (CT * H16(s) + s[16]) + s[17])
#define H20(s) (CT * (CT * H18(s) + s[18]) + s[19])
#define H22(s) (CT * (CT * H20(s) + s[20]) + s[21])
#define H24(s) (CT * (CT * H22(s) + s[22]) + s[23])
#define H26(s) (CT * (CT * H24(s) + s[24]) + s[25])
#define H28(s) (CT * (CT * H26(s) + s[26]) + s[27])
#define H30(s) (CT * (CT * H28(s) + s[28]) + s[29])
#define H32(s) (CT * (CT * H30(s) + s[30]) + s[31])
#define H34(s) (CT * (CT * H32(s) + s[32]) + s[33])
#define H36(s) (CT * (CT * H34(s) + s[34]) + s[35])
#define H38(s) (CT * (CT * H36(s) + s[36]) + s[37])
#define H40(s) (CT * (CT * H38(s) + s[38]) + s[39])
#define H42(s) (CT * (CT * H40(s) + s[40]) + s[41])
#define H44(s) (CT * (CT * H42(s) + s[42]) + s[43])
#define H46(s) (CT * (CT * H44(s) + s[44]) + s[45])
#define H48(s) (CT * (CT * H46(s) + s[46]) + s[47])
#define H50(s) (CT * (CT * H48(s) + s[48]) + s[49])
#define H52(s) (CT * (CT * H50(s) + s[50]) + s[51])
#define H54(s) (CT * (CT * H52(s) + s[52]) + s[53])
#define H56(s) (CT * (CT * H54(s) + s[54]) + s[55])
#define H58(s) (CT * (CT * H56(s) + s[56]) + s[57])
#define H60(s) (CT * (CT * H58(s) + s[58]) + s[59])
#define H62(s) (CT * (CT * H60(s) + s[60]) + s[61])
#define H64(s) (CT * (CT * H62(s) + s[62]) + s[63])
#define H66(s) (CT * (CT * H64(s) + s[64]) + s[65])
#define H68(s) (CT * (CT * H66(s) + s[66]) + s[67])
#define H70(s) (CT * (CT * H68(s) + s[68]) + s[69])
#define H72(s) (CT * (CT * H70(s) + s[70]) + s[71])
#define H74(s) (CT * (CT * H72(s) + s[72]) + s[73])
#define H76(s) (CT * (CT * H74(s) + s[74]) + s[75])
#define H78(s) (CT * (CT * H76(s) + s[76]) + s[77])
#define H80(s) (CT * (CT * H78(s) + s[78]) + s[79])
#define H82(s) (CT * (CT * H80(s) + s[80]) + s[81])
#define H84(s) (CT * (CT * H82(s) + s[82]) + s[83])
#define H86(s) (CT * (CT * H84(s) + s[84]) + s[85])
#define H88(s) (CT * (CT * H86(s) + s[86]) + s[87])
#define H90(s) (CT * (CT * H88(s) + s[88]) + s[89])
#define H92(s) (CT * (CT * H90(s) + s[90]) + s[91])
#define H94(s) (CT * (CT * H92(s) + s[92]) + s[93])
#define H96(s) (CT * (CT * H94(s) + s[94]) + s[95])
#define H98(s) (CT * (CT * H96(s) + s[96]) + s[97])
#define H100(s) (CT * (CT * H98(s) + s[98]) + s[99])
#define H102(s) (CT * (CT * H100(s) + s[100]) + s[101])
#define H104(s) (CT * (CT * H102(s) + s[102]) + s[103])
#define H106(s) (CT * (CT * H104(s) + s[104]) + s[105])
#define H108(s) (CT * (CT * H106(s) + s[106]) + s[107])
#define H110(s) (CT * (CT * H108(s) + s[108]) + s[109])
#define H112(s) (CT * (CT * H110(s) + s[110]) + s[111])
#define H114(s) (CT * (CT * H112(s) + s[112]) + s[113])
#define H116(s) (CT * (CT * H114(s) + s[114]) + s[115])
#define H118(s) (CT * (CT * H116(s) + s[116]) + s[117])
#define H120(s) (CT * (CT * H118(s) + s[118]) + s[119])
#define H122(s) (CT * (CT * H120(s) + s[120]) + s[121])
#define H124(s) (CT * (CT * H122(s) + s[122]) + s[123])
#define H126(s) (CT * (CT * H124(s) + s[124]) + s[125])
#define H128(s) (CT * (CT * H126(s) + s[126]) + s[127])
#define H130(s) (CT * (CT * H128(s) + s[128]) + s[129])
#define H132(s) (CT * (CT * H130(s) + s[130]) + s[131])
#define H134(s) (CT * (CT * H132(s) + s[132]) + s[133])
#define H136(s) (CT * (CT * H134(s) + s[134]) + s[135])
#define H138(s) (CT * (CT * H136(s) + s[136]) + s[137])
#define H140(s) (CT * (CT * H138(s) + s[138]) + s[139])
#define H142(s) (CT * (CT * H140(s) + s[140]) + s[141])
#define H144(s) (CT * (CT * H142(s) + s[142]) + s[143])
#define H146(s) (CT * (CT * H144(s) + s[144]) + s[145])
#define H148(s) (CT * (CT * H146(s) + s[146]) + s[147])
#define H150(s) (CT * (CT * H148(s) + s[148]) + s[149])
#define H152(s) (CT * (CT * H150(s) + s[150]) + s[151])
#define H154(s) (CT * (CT * H152(s) + s[152]) + s[153])
#define H156(s) (CT * (CT * H154(s) + s[154]) + s[155])
#define H158(s) (CT * (CT * H156(s) + s[156]) + s[157])
#define H160(s) (CT * (CT * H158(s) + s[158]) + s[159])
#define H162(s) (CT * (CT * H160(s) + s[160]) + s[161])
#define H164(s) (CT * (CT * H162(s) + s[162]) + s[163])
#define H166(s) (CT * (CT * H164(s) + s[164]) + s[165])
#define H168(s) (CT * (CT * H166(s) + s[166]) + s[167])
#define H170(s) (CT * (CT * H168(s) + s[168]) + s[169])
#define H172(s) (CT * (CT * H170(s) + s[170]) + s[171])
#define H174(s) (CT * (CT * H172(s) + s[172]) + s[173])
#define H176(s) (CT * (CT * H174(s) + s[174]) + s[175])
#define H178(s) (CT * (CT * H176(s) + s[176]) + s[177])
#define H180(s) (CT * (CT * H178(s) + s[178]) + s[179])
#define H182(s) (CT * (CT * H180(s) + s[180]) + s[181])
#define H184(s) (CT * (CT * H182(s) + s[182]) + s[183])
#define H186(s) (CT * (CT * H184(s) + s[184]) + s[185])
#define H188(s) (CT * (CT * H186(s) + s[186]) + s[187])
#define H190(s) (CT * (CT * H188(s) + s[188]) + s[189])
#define H192(s) (CT * (CT * H190(s) + s[190]) + s[191])
#define H194(s) (CT * (CT * H192(s) + s[192]) + s[193])
#define H196(s) (CT * (CT * H194(s) + s[194]) + s[195])
#define H198(s) (CT * (CT * H196(s) + s[196]) + s[197])
#define H200(s) (CT * (CT * H198(s) + s[198]) + s[199])
#define H202(s) (CT * (CT * H200(s) + s[200]) + s[201])
#define H204(s) (CT * (CT * H202(s) + s[202]) + s[203])
#define H206(s) (CT * (CT * H204(s) + s[204]) + s[205])
#define H208(s) (CT * (CT * H206(s) + s[206]) + s[207])
#define H210(s) (CT * (CT * H208(s) + s[208]) + s[209])
#define H212(s) (CT * (CT * H210(s) + s[210]) + s[211])
#define H214(s) (CT * (CT * H212(s) + s[212]) + s[213])
#define H216(s) (CT * (CT * H214(s) + s[214]) + s[215])
#define H218(s) (CT * (CT * H216(s) + s[216]) + s[217])
#define H220(s) (CT * (CT * H218(s) + s[218]) + s[219])
#define H222(s) (CT * (CT * H220(s) + s[220]) + s[221])
#define H224(s) (CT * (CT * H222(s) + s[222]) + s[223])
#define H226(s) (CT * (CT * H224(s) + s[224]) + s[225])
#define H228(s) (CT * (CT * H226(s) + s[226]) + s[227])
#define H230(s) (CT * (CT * H228(s) + s[228]) + s[229])
#define H232(s) (CT * (CT * H230(s) + s[230]) + s[231])
#define H234(s) (CT * (CT * H232(s) + s[232]) + s[233])
#define H236(s) (CT * (CT * H234(s) + s[234]) + s[235])
#define H238(s) (CT * (CT * H236(s) + s[236]) + s[237])
#define H240(s) (CT * (CT * H238(s) + s[238]) + s[239])
#define H242(s) (CT * (CT * H240(s) + s[240]) + s[241])
#define H244(s) (CT * (CT * H242(s) + s[242]) + s[243])
#define H246(s) (CT * (CT * H244(s) + s[244]) + s[245])
#define H248(s) (CT * (CT * H246(s) + s[246]) + s[247])
#define H250(s) (CT * (CT * H248(s) + s[248]) + s[249])
#define H252(s) (CT * (CT * H250(s) + s[250]) + s[251])
#define H254(s) (CT * (CT * H252(s) + s[252]) + s[253])
#define STRHASH(s) ((unsigned int)\
( \
sizeof(s) == 1 ? s[0] \
: sizeof(s) == 2 ? H2(s) \
: sizeof(s) == 3 ? (CT * H2(s) + s[2]) \
: sizeof(s) == 4 ? H4(s) \
: sizeof(s) == 5 ? (CT * H4(s) + s[4]) \
: sizeof(s) == 6 ? H6(s) \
: sizeof(s) == 7 ? (CT * H6(s) + s[6]) \
: sizeof(s) == 8 ? H8(s) \
: sizeof(s) == 9 ? (CT * H8(s) + s[8]) \
: sizeof(s) == 10 ? H10(s) \
: sizeof(s) == 11 ? (CT * H10(s) + s[10]) \
: sizeof(s) == 12 ? H12(s) \
: sizeof(s) == 13 ? (CT * H12(s) + s[12]) \
: sizeof(s) == 14 ? H14(s) \
: sizeof(s) == 15 ? (CT * H14(s) + s[14]) \
: sizeof(s) == 16 ? H16(s) \
: sizeof(s) == 17 ? (CT * H16(s) + s[16]) \
: sizeof(s) == 18 ? H18(s) \
: sizeof(s) == 19 ? (CT * H18(s) + s[18]) \
: sizeof(s) == 20 ? H20(s) \
: sizeof(s) == 21 ? (CT * H20(s) + s[20]) \
: sizeof(s) == 22 ? H22(s) \
: sizeof(s) == 23 ? (CT * H22(s) + s[22]) \
: sizeof(s) == 24 ? H24(s) \
: sizeof(s) == 25 ? (CT * H24(s) + s[24]) \
: sizeof(s) == 26 ? H26(s) \
: sizeof(s) == 27 ? (CT * H26(s) + s[26]) \
: sizeof(s) == 28 ? H28(s) \
: sizeof(s) == 29 ? (CT * H28(s) + s[28]) \
: sizeof(s) == 30 ? H30(s) \
: sizeof(s) == 31 ? (CT * H30(s) + s[30]) \
: sizeof(s) == 32 ? H32(s) \
: sizeof(s) == 33 ? (CT * H32(s) + s[32]) \
: sizeof(s) == 34 ? H34(s) \
: sizeof(s) == 35 ? (CT * H34(s) + s[34]) \
: sizeof(s) == 36 ? H36(s) \
: sizeof(s) == 37 ? (CT * H36(s) + s[36]) \
: sizeof(s) == 38 ? H38(s) \
: sizeof(s) == 39 ? (CT * H38(s) + s[38]) \
: sizeof(s) == 40 ? H40(s) \
: sizeof(s) == 41 ? (CT * H40(s) + s[40]) \
: sizeof(s) == 42 ? H42(s) \
: sizeof(s) == 43 ? (CT * H42(s) + s[42]) \
: sizeof(s) == 44 ? H44(s) \
: sizeof(s) == 45 ? (CT * H44(s) + s[44]) \
: sizeof(s) == 46 ? H46(s) \
: sizeof(s) == 47 ? (CT * H46(s) + s[46]) \
: sizeof(s) == 48 ? H48(s) \
: sizeof(s) == 49 ? (CT * H48(s) + s[48]) \
: sizeof(s) == 50 ? H50(s) \
: sizeof(s) == 51 ? (CT * H50(s) + s[50]) \
: sizeof(s) == 52 ? H52(s) \
: sizeof(s) == 53 ? (CT * H52(s) + s[52]) \
: sizeof(s) == 54 ? H54(s) \
: sizeof(s) == 55 ? (CT * H54(s) + s[54]) \
: sizeof(s) == 56 ? H56(s) \
: sizeof(s) == 57 ? (CT * H56(s) + s[56]) \
: sizeof(s) == 58 ? H58(s) \
: sizeof(s) == 59 ? (CT * H58(s) + s[58]) \
: sizeof(s) == 60 ? H60(s) \
: sizeof(s) == 61 ? (CT * H60(s) + s[60]) \
: sizeof(s) == 62 ? H62(s) \
: sizeof(s) == 63 ? (CT * H62(s) + s[62]) \
: sizeof(s) == 64 ? H64(s) \
: sizeof(s) == 65 ? (CT * H64(s) + s[64]) \
: sizeof(s) == 66 ? H66(s) \
: sizeof(s) == 67 ? (CT * H66(s) + s[66]) \
: sizeof(s) == 68 ? H68(s) \
: sizeof(s) == 69 ? (CT * H68(s) + s[68]) \
: sizeof(s) == 70 ? H70(s) \
: sizeof(s) == 71 ? (CT * H70(s) + s[70]) \
: sizeof(s) == 72 ? H72(s) \
: sizeof(s) == 73 ? (CT * H72(s) + s[72]) \
: sizeof(s) == 74 ? H74(s) \
: sizeof(s) == 75 ? (CT * H74(s) + s[74]) \
: sizeof(s) == 76 ? H76(s) \
: sizeof(s) == 77 ? (CT * H76(s) + s[76]) \
: sizeof(s) == 78 ? H78(s) \
: sizeof(s) == 79 ? (CT * H78(s) + s[78]) \
: sizeof(s) == 80 ? H80(s) \
: sizeof(s) == 81 ? (CT * H80(s) + s[80]) \
: sizeof(s) == 82 ? H82(s) \
: sizeof(s) == 83 ? (CT * H82(s) + s[82]) \
: sizeof(s) == 84 ? H84(s) \
: sizeof(s) == 85 ? (CT * H84(s) + s[84]) \
: sizeof(s) == 86 ? H86(s) \
: sizeof(s) == 87 ? (CT * H86(s) + s[86]) \
: sizeof(s) == 88 ? H88(s) \
: sizeof(s) == 89 ? (CT * H88(s) + s[88]) \
: sizeof(s) == 90 ? H90(s) \
: sizeof(s) == 91 ? (CT * H90(s) + s[90]) \
: sizeof(s) == 92 ? H92(s) \
: sizeof(s) == 93 ? (CT * H92(s) + s[92]) \
: sizeof(s) == 94 ? H94(s) \
: sizeof(s) == 95 ? (CT * H94(s) + s[94]) \
: sizeof(s) == 96 ? H96(s) \
: sizeof(s) == 97 ? (CT * H96(s) + s[96]) \
: sizeof(s) == 98 ? H98(s) \
: sizeof(s) == 99 ? (CT * H98(s) + s[98]) \
: sizeof(s) == 100 ? H100(s) \
: sizeof(s) == 101 ? (CT * H100(s) + s[100]) \
: sizeof(s) == 102 ? H102(s) \
: sizeof(s) == 103 ? (CT * H102(s) + s[102]) \
: sizeof(s) == 104 ? H104(s) \
: sizeof(s) == 105 ? (CT * H104(s) + s[104]) \
: sizeof(s) == 106 ? H106(s) \
: sizeof(s) == 107 ? (CT * H106(s) + s[106]) \
: sizeof(s) == 108 ? H108(s) \
: sizeof(s) == 109 ? (CT * H108(s) + s[108]) \
: sizeof(s) == 110 ? H110(s) \
: sizeof(s) == 111 ? (CT * H110(s) + s[110]) \
: sizeof(s) == 112 ? H112(s) \
: sizeof(s) == 113 ? (CT * H112(s) + s[112]) \
: sizeof(s) == 114 ? H114(s) \
: sizeof(s) == 115 ? (CT * H114(s) + s[114]) \
: sizeof(s) == 116 ? H116(s) \
: sizeof(s) == 117 ? (CT * H116(s) + s[116]) \
: sizeof(s) == 118 ? H118(s) \
: sizeof(s) == 119 ? (CT * H118(s) + s[118]) \
: sizeof(s) == 120 ? H120(s) \
: sizeof(s) == 121 ? (CT * H120(s) + s[120]) \
: sizeof(s) == 122 ? H122(s) \
: sizeof(s) == 123 ? (CT * H122(s) + s[122]) \
: sizeof(s) == 124 ? H124(s) \
: sizeof(s) == 125 ? (CT * H124(s) + s[124]) \
: sizeof(s) == 126 ? H126(s) \
: sizeof(s) == 127 ? (CT * H126(s) + s[126]) \
: sizeof(s) == 128 ? H128(s) \
: sizeof(s) == 129 ? (CT * H128(s) + s[128]) \
: sizeof(s) == 130 ? H130(s) \
: sizeof(s) == 131 ? (CT * H130(s) + s[130]) \
: sizeof(s) == 132 ? H132(s) \
: sizeof(s) == 133 ? (CT * H132(s) + s[132]) \
: sizeof(s) == 134 ? H134(s) \
: sizeof(s) == 135 ? (CT * H134(s) + s[134]) \
: sizeof(s) == 136 ? H136(s) \
: sizeof(s) == 137 ? (CT * H136(s) + s[136]) \
: sizeof(s) == 138 ? H138(s) \
: sizeof(s) == 139 ? (CT * H138(s) + s[138]) \
: sizeof(s) == 140 ? H140(s) \
: sizeof(s) == 141 ? (CT * H140(s) + s[140]) \
: sizeof(s) == 142 ? H142(s) \
: sizeof(s) == 143 ? (CT * H142(s) + s[142]) \
: sizeof(s) == 144 ? H144(s) \
: sizeof(s) == 145 ? (CT * H144(s) + s[144]) \
: sizeof(s) == 146 ? H146(s) \
: sizeof(s) == 147 ? (CT * H146(s) + s[146]) \
: sizeof(s) == 148 ? H148(s) \
: sizeof(s) == 149 ? (CT * H148(s) + s[148]) \
: sizeof(s) == 150 ? H150(s) \
: sizeof(s) == 151 ? (CT * H150(s) + s[150]) \
: sizeof(s) == 152 ? H152(s) \
: sizeof(s) == 153 ? (CT * H152(s) + s[152]) \
: sizeof(s) == 154 ? H154(s) \
: sizeof(s) == 155 ? (CT * H154(s) + s[154]) \
: sizeof(s) == 156 ? H156(s) \
: sizeof(s) == 157 ? (CT * H156(s) + s[156]) \
: sizeof(s) == 158 ? H158(s) \
: sizeof(s) == 159 ? (CT * H158(s) + s[158]) \
: sizeof(s) == 160 ? H160(s) \
: sizeof(s) == 161 ? (CT * H160(s) + s[160]) \
: sizeof(s) == 162 ? H162(s) \
: sizeof(s) == 163 ? (CT * H162(s) + s[162]) \
: sizeof(s) == 164 ? H164(s) \
: sizeof(s) == 165 ? (CT * H164(s) + s[164]) \
: sizeof(s) == 166 ? H166(s) \
: sizeof(s) == 167 ? (CT * H166(s) + s[166]) \
: sizeof(s) == 168 ? H168(s) \
: sizeof(s) == 169 ? (CT * H168(s) + s[168]) \
: sizeof(s) == 170 ? H170(s) \
: sizeof(s) == 171 ? (CT * H170(s) + s[170]) \
: sizeof(s) == 172 ? H172(s) \
: sizeof(s) == 173 ? (CT * H172(s) + s[172]) \
: sizeof(s) == 174 ? H174(s) \
: sizeof(s) == 175 ? (CT * H174(s) + s[174]) \
: sizeof(s) == 176 ? H176(s) \
: sizeof(s) == 177 ? (CT * H176(s) + s[176]) \
: sizeof(s) == 178 ? H178(s) \
: sizeof(s) == 179 ? (CT * H178(s) + s[178]) \
: sizeof(s) == 180 ? H180(s) \
: sizeof(s) == 181 ? (CT * H180(s) + s[180]) \
: sizeof(s) == 182 ? H182(s) \
: sizeof(s) == 183 ? (CT * H182(s) + s[182]) \
: sizeof(s) == 184 ? H184(s) \
: sizeof(s) == 185 ? (CT * H184(s) + s[184]) \
: sizeof(s) == 186 ? H186(s) \
: sizeof(s) == 187 ? (CT * H186(s) + s[186]) \
: sizeof(s) == 188 ? H188(s) \
: sizeof(s) == 189 ? (CT * H188(s) + s[188]) \
: sizeof(s) == 190 ? H190(s) \
: sizeof(s) == 191 ? (CT * H190(s) + s[190]) \
: sizeof(s) == 192 ? H192(s) \
: sizeof(s) == 193 ? (CT * H192(s) + s[192]) \
: sizeof(s) == 194 ? H194(s) \
: sizeof(s) == 195 ? (CT * H194(s) + s[194]) \
: sizeof(s) == 196 ? H196(s) \
: sizeof(s) == 197 ? (CT * H196(s) + s[196]) \
: sizeof(s) == 198 ? H198(s) \
: sizeof(s) == 199 ? (CT * H198(s) + s[198]) \
: sizeof(s) == 200 ? H200(s) \
: sizeof(s) == 201 ? (CT * H200(s) + s[200]) \
: sizeof(s) == 202 ? H202(s) \
: sizeof(s) == 203 ? (CT * H202(s) + s[202]) \
: sizeof(s) == 204 ? H204(s) \
: sizeof(s) == 205 ? (CT * H204(s) + s[204]) \
: sizeof(s) == 206 ? H206(s) \
: sizeof(s) == 207 ? (CT * H206(s) + s[206]) \
: sizeof(s) == 208 ? H208(s) \
: sizeof(s) == 209 ? (CT * H208(s) + s[208]) \
: sizeof(s) == 210 ? H210(s) \
: sizeof(s) == 211 ? (CT * H210(s) + s[210]) \
: sizeof(s) == 212 ? H212(s) \
: sizeof(s) == 213 ? (CT * H212(s) + s[212]) \
: sizeof(s) == 214 ? H214(s) \
: sizeof(s) == 215 ? (CT * H214(s) + s[214]) \
: sizeof(s) == 216 ? H216(s) \
: sizeof(s) == 217 ? (CT * H216(s) + s[216]) \
: sizeof(s) == 218 ? H218(s) \
: sizeof(s) == 219 ? (CT * H218(s) + s[218]) \
: sizeof(s) == 220 ? H220(s) \
: sizeof(s) == 221 ? (CT * H220(s) + s[220]) \
: sizeof(s) == 222 ? H222(s) \
: sizeof(s) == 223 ? (CT * H222(s) + s[222]) \
: sizeof(s) == 224 ? H224(s) \
: sizeof(s) == 225 ? (CT * H224(s) + s[224]) \
: sizeof(s) == 226 ? H226(s) \
: sizeof(s) == 227 ? (CT * H226(s) + s[226]) \
: sizeof(s) == 228 ? H228(s) \
: sizeof(s) == 229 ? (CT * H228(s) + s[228]) \
: sizeof(s) == 230 ? H230(s) \
: sizeof(s) == 231 ? (CT * H230(s) + s[230]) \
: sizeof(s) == 232 ? H232(s) \
: sizeof(s) == 233 ? (CT * H232(s) + s[232]) \
: sizeof(s) == 234 ? H234(s) \
: sizeof(s) == 235 ? (CT * H234(s) + s[234]) \
: sizeof(s) == 236 ? H236(s) \
: sizeof(s) == 237 ? (CT * H236(s) + s[236]) \
: sizeof(s) == 238 ? H238(s) \
: sizeof(s) == 239 ? (CT * H238(s) + s[238]) \
: sizeof(s) == 240 ? H240(s) \
: sizeof(s) == 241 ? (CT * H240(s) + s[240]) \
: sizeof(s) == 242 ? H242(s) \
: sizeof(s) == 243 ? (CT * H242(s) + s[242]) \
: sizeof(s) == 244 ? H244(s) \
: sizeof(s) == 245 ? (CT * H244(s) + s[244]) \
: sizeof(s) == 246 ? H246(s) \
: sizeof(s) == 247 ? (CT * H246(s) + s[246]) \
: sizeof(s) == 248 ? H248(s) \
: sizeof(s) == 249 ? (CT * H248(s) + s[248]) \
: sizeof(s) == 250 ? H250(s) \
: sizeof(s) == 251 ? (CT * H250(s) + s[250]) \
: sizeof(s) == 252 ? H252(s) \
: sizeof(s) == 253 ? (CT * H252(s) + s[252]) \
: sizeof(s) == 254 ? H254(s) \
: -1 \
))

编译时间（预处理器）字符串散列

9 个答案: