C++ 调用 std::max 时出现问题
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2789481/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Problem calling std::max
提问by Haiyang
I compiled my bison-generated files in Visual Studio and got these errors:
我在 Visual Studio 中编译了我的野牛生成的文件并得到了这些错误：
...\position.hh(83): error C2589: '(' : illegal token on right side of '::'
...\position.hh(83): error C2059: syntax error : '::'
...\position.hh(83): error C2589: '(' : illegal token on right side of '::'
...\position.hh(83): error C2059: syntax error : '::'
...\position.hh(83): 错误 C2589: '(' : '::' 右侧的非法标记
...\position.hh(83): 错误 C2059: 语法错误: '::'
。 ..\position.hh(83): 错误 C2589: '(' : '::' 右侧的非法标记
...\position.hh(83): 错误 C2059: 语法错误: '::'
The corresponding code is:
对应的代码是：
inline void columns (int count = 1)
{
column = std::max (1u, column + count);
}
I think the problem is with std::max; if I change std::max to equivalent code then there is no problem anymore, but is there a better solution instead of changing the generated code?
我认为问题在于 std::max; 如果我将 std::max 更改为等效代码，那么就没有问题了，但是有没有更好的解决方案而不是更改生成的代码？
Here is the bison file I wrote:
这是我写的野牛文件：
//
// bison.yy
//
%skeleton "lalr1.cc"
%require "2.4.2"
%defines
%define parser_class_name "cmd_parser"
%locations
%debug
%error-verbose
%code requires {
class ParserDriver;
}
%parse-param { ParserDriver& driver }
%lex-param { ParserDriver& driver }
%union {
struct ast *a;
double d;
struct symbol *s;
struct symlist *sl;
int fn;
}
%code {
#include "helper_func.h"
#include "ParserDriver.h"
std::string error_msg = "";
}
%token <d> NUMBER
%token <s> NAME
%token <fn> FUNC
%token EOL
%token IF THEN ELSE WHILE DO LET
%token SYM_TABLE_OVERFLOW
%token UNKNOWN_CHARACTER
%nonassoc <fn> CMP
%right '='
%left '+' '-'
%left '*' '/'
%nonassoc '|' UMINUS
%type <a> exp stmt list explist
%type <sl> symlist
%{
extern int yylex(yy::cmd_parser::semantic_type *yylval,
yy::cmd_parser::location_type* yylloc);
%}
%start calclist
%%
... grammar rules ...
回答by James McNellis
You are probably including windows.hsomewhere, which defines macros named maxand min.
您可能包含windows.h某个地方，它定义了名为max和 的宏min。
You can #define NOMINMAXbefore including windows.hto prevent it from defining those macros, or you can prevent macro invocation by using an extra set of parentheses:
您可以#define NOMINMAX在包含之前windows.h阻止它定义这些宏，或者您可以通过使用一组额外的括号来阻止宏调用：
column = (std::max)(1u, column + count);
回答by Rob Kennedy
Define the NOMINMAX symbol at the top of your source, before you include any headers. Visual C++ defines minand maxas macros somewhere in windows.h, and they interfere with your use of the corresponding standard functions.
在包含任何标题之前，在源顶部定义 NOMINMAX 符号。Visual C++ 将min和定义max为windows.h 中某处的宏，它们会干扰您对相应标准函数的使用。
#define NOMINMAX
