First, prefacePrior to understanding the use of okhttp cache, and the use of the cache is a preliminary summary of 80650856. The cache is primarily intended to obtain resource information directly from the cache in the absence of a network, or when
1 OverviewUsed preprocessing commands starting. For example, include the command # include and macro definition command # define. In the source program, these commands are placed outside the function, and are generally placed before the source file.
When there is too much code in your code, it is especially inconvenient to read the code, and you need to use a newline character "\". Be aware of two points when using line breaks:
The 1.c compiler is based on ";" To determine if it is a statement,
Error Description:Today in the use of Qt to write a C + + function template test program, compile time, compile the time when the following error occurred:The error description is: In the main function, when the function max () overloaded, there
Original: http://www.cnblogs.com/GavinDai/archive/2011/10/24/2222735.htmlWe are in the program design, always use the definition of variables and the declaration of variables, but sometimes we are not very clear about the concept, know how it is
In C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a string of formatting, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are
In the C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a format string, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are
Replace macros with inline:
1. Inline functions can be debugged at run time, while macro definitions are not possible;2. The compiler will do security checks or automatic type conversions (with normal functions) on the parameter types of the
variable declarations and variable definitions
Variable definitions: Used to allocate storage space for a variable, and to specify an initial value for a variable. In a program, a variable has and has only one definition.
Variable declaration: Used
C ++ File include rule constant definition
To sum up, C ++'s function declaration, variable declaration, and class definition are written in the header file, while function implementation, variable definition, and class method implementation are
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