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Questions - preprocessor

Preprocessor pragma precedence with #if

I'm using the IAR Embedded Workbench compiler and have an issue with precedence of #pragma with #if. I'm using #if 0 during development to comment out code. The #pragma in the code below is to suppres...
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Thomas Matthews

c++

c

language-lawyer

preprocessor

pragma

Votes: 0

Answers: 2

Latest Answer

The standard says that the #pragmas should be ignored, which is consistent with what you see. (The error message was not suppressed.) 6.10.1p6: … Each directive’s condition is checked in order. If it...
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rici

Preprocessor definitions based on visual studio configuration type

I am working on a C++ project in Visual Studio 2019, which should have the ability to be compiled as an executable and as a DLL. It is legacy code and contains the preprocessor flags AS_EXE and AS_DLL...
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NollerNiller

c++

visual-studio

visual-studio-2019

preprocessor

Votes: 0

Answers: 1

Latest Answer

You can use Condition attribute of ItemDefinitionGroup node in your .vcxproj. <ItemDefinitionGroup Condition="'$(Configuration)'=='MyConfigForDLL'"> <ClCompile> <Preproc...
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Osyotr

Selecting values from dataframe based on multiple column values

I have a dataframe in this format: ageClass sex nationality treatment unique_id netTime clockTime 0 20 M KEN Treatment 354658649da56c20c72b6689d2b7e1b8cc334ac9 7661 7661 1 20 M KEN Treatmen...
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i4cfutures

python

pandas

dataframe

pandas-groupby

preprocessor

Votes: 0

Answers: 3

Latest Answer

You can pivot the table with means you produced df2 = df.groupby(['ageClass','treatment'])[['clockTime']].mean().reset_index().pivot(columns=['ageClass'], values='clockTime', index='treatment') ageCl...
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Patryk Kowalski

Why only include header files (.h) but not the source file (.c) in the directives?

How does the compiler know which source file is the one I am including? Does it work as long as the name of the header and source file are the same? For example, the header file example.h refers to ex...
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Captain Toad

c

module

header-files

preprocessor

compiler-directives

c

module

header-files

preprocessor

compiler-directives

Votes: 0

Answers: 1

Latest Answer

How does the compiler know which source file is the one I am including? It doesn’t. The compiler only knows what you tell it. Header files are designed to tell the compiler what exists elsewhere. D...
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D&#250;thomhas

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