Adding second C++ project to demonstrate PyBind11 usage alongside CPython extensions.

2018-09-05 11:37:50 -07:00 · 2018-09-05 11:37:50 -07:00 · 62b3ab3d79
--- a/CppAndPython.sln
+++ b/CppAndPython.sln
@ -12,6 +12,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		README.md = README.md
 	EndProjectSection
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "superfastcode2", "superfastcode2\superfastcode2.vcxproj", "{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@ -38,6 +40,16 @@ Global
 		{28F6146F-9862-4C07-A931-F3DE0A093BB7}.Release|x64.Build.0 = Release|x64
 		{28F6146F-9862-4C07-A931-F3DE0A093BB7}.Release|x86.ActiveCfg = Release|Win32
 		{28F6146F-9862-4C07-A931-F3DE0A093BB7}.Release|x86.Build.0 = Release|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Debug|x64.ActiveCfg = Debug|x64
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Debug|x64.Build.0 = Debug|x64
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Debug|x86.ActiveCfg = Debug|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Debug|x86.Build.0 = Debug|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Release|Any CPU.ActiveCfg = Release|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Release|x64.ActiveCfg = Release|x64
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Release|x64.Build.0 = Release|x64
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Release|x86.ActiveCfg = Release|Win32
+		{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/CppAndPython/CppAndPython.py
+++ b/CppAndPython/CppAndPython.py
@ -17,15 +17,6 @@ def tanh(x):
    tanh_x = sinh(x) / cosh(x)
    return tanh_x

-def sequence_tanh(data):
-    '''Applies the hyperbolic tangent function to map all values in
-    the sequence to a value between -1.0 and 1.0.
-    '''
-    result = []
-    for x in data:
-        result.append(tanh(x))
-    return result
-
 def test(fn, name):
    start = perf_counter()
    result = fn(DATA)
@ -38,9 +29,10 @@ def test(fn, name):
 if __name__ == "__main__":
    print('Running benchmarks with COUNT = {}'.format(COUNT))

-    test(sequence_tanh, 'sequence_tanh')
-
-    test(lambda d: [tanh(x) for x in d], '[tanh(x) for x in d]')
-
+    test(lambda d: [tanh(x) for x in d], '[tanh(x) for x in d] (Python implementation)')
+    
    from superfastcode import fast_tanh
-    test(lambda d: [fast_tanh(x) for x in d], '[fast_tanh(x) for x in d]')
+    test(lambda d: [fast_tanh(x) for x in d], '[fast_tanh(x) for x in d] (CPython C++ extension)')
+
+    from superfastcode2 import fast_tanh2
+    test(lambda d: [fast_tanh2(x) for x in d], '[fast_tanh2(x) for x in d] (PyBind11 C++ extension)')
--- a/CppAndPython/CppAndPython.pyproj
+++ b/CppAndPython/CppAndPython.pyproj
@ -27,6 +27,11 @@
    <Compile Include="CppAndPython.py" />
  </ItemGroup>
  <ItemGroup>
+    <ProjectReference Include="..\superfastcode2\superfastcode2.vcxproj">
+      <Name>superfastcode2</Name>
+      <Project>{98d5e983-ce8c-4ae5-9da2-0374c81bfb86}</Project>
+      <Private>True</Private>
+    </ProjectReference>
    <ProjectReference Include="..\superfastcode\superfastcode.vcxproj">
      <Name>superfastcode</Name>
      <Project>{28f6146f-9862-4c07-a931-f3de0a093bb7}</Project>
--- a/README.md
+++ b/README.md
@ -1,11 +1,18 @@
 # python-sample-vs-cpp-extension

-This sample is the end product for the walkthrough on https://docs.microsoft.com/en-us/visualstudio/python/working-with-c-cpp-python-in-visual-studio. Note that you must
-have the "Python native development tools" option selected for the Python development workload in the Visual Studio 2017 installer.
+This sample is the end product for the walkthrough on https://docs.microsoft.com/en-us/visualstudio/python/working-with-c-cpp-python-in-visual-studio.
+You must have the "Python native development tools" option selected for the Python development workload in the Visual Studio 2017 installer.

-Because the "superfastcode" C++ project contains a few hard-coded pathnames and is also configured to compile using the Visual Studio 2017 toolset, you may need to
-change a few project properties to make it work on your computer. For the latter two you can just set the PYTHONPATH environment variable accordingly, which is the only change
-needed for Visual Studio 2017.
+The superfastcode and superfastcode2 projects contain identical implementations of a hyperbolic tangent function. In the superfastcode project, the
+module is exposed to Python using the extension methods for CPython. In the superfastcode2 project, the module is exposed using PyBind11.
+
+The CppAndPython project contains a little Python code that implements the same function using straight Python, then runs all three implementations
+to provide comparative results. Note that you may need to update the selected environment under the **Python Environments** node. The sample was
+written for Python 3.6 (32-bit). Make sure a suitable environment is selected here.
+
+Because the superfastcode and superfastcode2 C++ projects contain a few hard-coded pathnames and is also configured to compile using the Visual Studio 2017 
+toolset, you may need to change a few project properties as described in the table below to make them work on your computer. For the latter two properties,
+just set the PYTHONPATH environment variable accordingly, which is the only change needed for Visual Studio 2017.

 | Project Property | Value in the example | Notes |
 | --- | --- | --- |
--- a/superfastcode/superfastcode.vcxproj
+++ b/superfastcode/superfastcode.vcxproj
@ -22,7 +22,7 @@
    <VCProjectVersion>15.0</VCProjectVersion>
    <ProjectGuid>{28F6146F-9862-4C07-A931-F3DE0A093BB7}</ProjectGuid>
    <RootNamespace>superfastcode</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
--- a/superfastcode2/module.cpp
+++ b/superfastcode2/module.cpp
@ -0,0 +1,32 @@
+#include <pybind11/pybind11.h>
+#include <Windows.h>
+#include <cmath>
+
+const double e = 2.7182818284590452353602874713527;
+
+double sinh_impl(double x) {
+	return (1 - pow(e, (-2 * x))) / (2 * pow(e, -x));
+}
+
+double cosh_impl(double x) {
+	return (1 + pow(e, (-2 * x))) / (2 * pow(e, -x));
+}
+
+double tanh_impl(double x) {
+	return sinh_impl(x) / cosh_impl(x);
+}
+
+namespace py = pybind11;
+
+PYBIND11_MODULE(superfastcode2, m) {
+	m.def("fast_tanh2", &tanh_impl, R"pbdoc(
+        Compute a hyperbolic tangent of a single argument expressed in radians.        
+    )pbdoc");
+
+
+#ifdef VERSION_INFO
+	m.attr("__version__") = VERSION_INFO;
+#else
+	m.attr("__version__") = "dev";
+#endif
+}
--- a/superfastcode2/setup.py
+++ b/superfastcode2/setup.py
@ -0,0 +1,20 @@
+import os, sys
+
+from distutils.core import setup, Extension
+from distutils import sysconfig
+
+cpp_args = ['-std=c++11', '-stdlib=libc++', '-mmacosx-version-min=10.7']
+
+sfc_module = Extension(
+    'superfastcode2', sources = ['module.cpp'],
+    include_dirs=['pybind11/include'],
+    language='c++',
+    extra_compile_args = cpp_args,
+    )
+
+setup(
+    name = 'superfastcode2',
+    version = '1.0',    
+    description = 'Python package with superfastcode2 C++ extension (PyBind11)',
+    ext_modules = [sfc_module],
+)
--- a/superfastcode2/superfastcode2.vcxproj
+++ b/superfastcode2/superfastcode2.vcxproj
@ -0,0 +1,207 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{98D5E983-CE8C-4AE5-9DA2-0374C81BFB86}</ProjectGuid>
+    <RootNamespace>superfastcode</RootNamespace>
+    <PythonVersion>3.6</PythonVersion>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
+    <ProjectName>superfastcode2</ProjectName>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
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+    <TargetExt>.pyd</TargetExt>
+    <LocalDebuggerCommand>$(PythonDExe)</LocalDebuggerCommand>
+    <LocalDebuggerCommandArguments>-i -c "print('&gt;&gt;&gt; import superfastcode'); import superfastcode"</LocalDebuggerCommandArguments>
+    <LocalDebuggerEnvironment>PYTHONPATH=$(OutDir)</LocalDebuggerEnvironment>
+    <DebuggerFlavor>$(DefaultDebuggerFlavor)</DebuggerFlavor>
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+    <LocalDebuggerCommandArguments>-i -c "print('&gt;&gt;&gt; import superfastcode'); import superfastcode"</LocalDebuggerCommandArguments>
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+    <Link>
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