string-literals

问题 Having this in gas: .text .globl main main: xor %eax, %eax lea str(%rip), %rdi call printf call exit str: .byte 0x7F, "ELF", 1,1,1,0 I thought the .byte directive could be concatenate as in nasm db 0x7F, "ELF", 1, 1, 1, 0 ; e_ident source : http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html 回答1: In GAS syntax, "ELF" is a symbol reference to the symbol name ELF , not a multi-char string. In the context of .byte directive, it's only looking for a number, not a possible string. And

问题 This question already has answers here : Java switch statement: Constant expression required, but it IS constant (13 answers) Closed 4 years ago . I was working on switch case. If we use class.getName(), then, I am getting error that "case expressions must be constant expressions" as follows: switch(param.getClass().getName()) { case String.class.getName(): // to do break; } Even if we do following, take string class name in a constant, then also, getting same error: public static final

问题 This question already has answers here : Java switch statement: Constant expression required, but it IS constant (13 answers) Closed 4 years ago . I was working on switch case. If we use class.getName(), then, I am getting error that "case expressions must be constant expressions" as follows: switch(param.getClass().getName()) { case String.class.getName(): // to do break; } Even if we do following, take string class name in a constant, then also, getting same error: public static final

问题 This question already has answers here : Java switch statement: Constant expression required, but it IS constant (13 answers) Closed 4 years ago . I was working on switch case. If we use class.getName(), then, I am getting error that "case expressions must be constant expressions" as follows: switch(param.getClass().getName()) { case String.class.getName(): // to do break; } Even if we do following, take string class name in a constant, then also, getting same error: public static final

问题 See this answer. I think your confusion is that you're mixing up the concept of string literals in source code with actual string values. What is the difference between string literals and string values? I did not understand this. 回答1: A string literal is a piece of text you can write in your program's source code, beginning and ending with quotation marks, that tells Python to create a string with certain contents. It looks like 'asdf' or ''' multiline content ''' or 'the thing at the end of

问题 In my application I will frequently pass references to a static string. I wish to avoid having Go allocate memory for each call, but I failed to get the address to my string literal. Why is it not possible to take the address of a string literal (see test1() in the example below)? Have I misunderstood the syntax, or is it a limitation due to the internal workings of Go? If not possible, what would be the best solution? test2() works, but will it allocate memory for the var hej each time?

问题 template<typename CharType> class StringTraits { public: static const CharType NULL_CHAR = '\0'; static constexpr CharType* WHITESPACE_STR = " "; }; typedef StringTraits<char> AStringTraits; typedef StringTraits<wchar_t> WStringTraits; I know I could do it with template specialization, but this would require some duplication (by defining string literals with and without L prefix). Is there a simpler way to define const/constexpr char/wchar_t and char*/wchar_t* with same string literal in a

问题 template<typename CharType> class StringTraits { public: static const CharType NULL_CHAR = '\0'; static constexpr CharType* WHITESPACE_STR = " "; }; typedef StringTraits<char> AStringTraits; typedef StringTraits<wchar_t> WStringTraits; I know I could do it with template specialization, but this would require some duplication (by defining string literals with and without L prefix). Is there a simpler way to define const/constexpr char/wchar_t and char*/wchar_t* with same string literal in a

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 9 months ago . I am from Python background and recently learning C++. I was learning a C/C++ function called memset and following the online example from website https://www.geeksforgeeks.org/memset-in-cpp/ where I got some compilation errors: /** * @author : Bhishan Poudel * @file : a02_memset_geeks.cpp * @created :

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 9 months ago . I am from Python background and recently learning C++. I was learning a C/C++ function called memset and following the online example from website https://www.geeksforgeeks.org/memset-in-cpp/ where I got some compilation errors: /** * @author : Bhishan Poudel * @file : a02_memset_geeks.cpp * @created :