C语言里没有bool类型。你可以自己定义一个bool类型。define bool int 就可以了。C语言中不存在bool这种内置数据类型．通常，布尔变量用整型变量代替．源文件扩展名是不是 .c, 如果是, 改成 .cpp编译器不支持c99ifndef BOOLdefine BOOL intendifVC当然支持bool类型了,可能是你的代码在bool声明的附近有错误
'bool' undeclared (first use in this function) (Each undeclared identifier is reported only once for each function it appears in.) 在Google在搜了半天,也没不明白。后来,只得请求高手。得到回复,总结于下: C语言(或C++)里本身没有bool这种布尔类型。有些编译器可以识别,那也是因为编译器自己定义了bool类...
Note:If the name of the library target is not a valid C++namespaceidentifier, you will need to provide theNAMESPACEargument. Otherwise, the name of the library will be used as the resource library's namespace. cmrc_add_resource_library(foo-resources ALIAS foo::rc NAMESPACE foo ...) ...
In this syntax: Guid.NewGuid()generates a new unique identifier of typeGuid. ToByteArray()converts theGuidto a byte array. ToByteArray()[15]accesses the least significant byte of theGuid. (ToByteArray()[15] & 1) == 1checks if the least significant bit is set, resulting in eithertru...
+ f.checkFails("boolor_agg(^*^)", "Unknown identifier '\\*'", false); + f.checkType("boolor_agg(true)", "BOOLEAN"); + f.checkFails("^boolor_agg(1)^", + "Cannot apply 'BOOLOR_AGG' to arguments of type 'BOOLOR_AGG\\(<INTEGER>\\)'\\. " ...
* SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless re...
client.c:441:19: error: use of undeclared identifier 'res' return (void *)(res == 0 ? Qtrue : Qfalse); ^ client.c:762:3: error: use of undeclared identifier 'my_bool' my_bool boolval; ^ client.c:793:7: error: use of undeclared identifier 'boolval' ...
Note that you may alsoremove()a previously added handler by using the identifier returned while adding it. This is particularly useful if you want to supersede the defaultstderrhandler: just calllogger.remove()to make a fresh start. Easier file logging with rotation / retention / compression ...