### Generic Build Instructions
#### Setup
To build Google Test and your tests that use it, you need to tell your build
system where to find its headers and source files. The exact way to do it
depends on which build system you use, and is usually straightforward.
### Build with CMake
Google Test comes with a CMake build script (
[CMakeLists.txt](https://github.com/google/googletest/blob/master/CMakeLists.txt))
that can be used on a wide range of platforms ("C" stands for cross-platform.).
If you don't have CMake installed already, you can download it for free from
<http://www.cmake.org/>.
CMake works by generating native makefiles or build projects that can be used in
the compiler environment of your choice. You can either build Google Test as a
standalone project or it can be incorporated into an existing CMake build for
another project.
#### Standalone CMake Project
When building Google Test as a standalone project, the typical workflow starts
with:
mkdir mybuild # Create a directory to hold the build output.
cd mybuild
cmake ${GTEST_DIR} # Generate native build scripts.
If you want to build Google Test's samples, you should replace the last command
with
cmake -Dgtest_build_samples=ON ${GTEST_DIR}
If you are on a \*nix system, you should now see a Makefile in the current
directory. Just type 'make' to build gtest.
If you use Windows and have Visual Studio installed, a `gtest.sln` file and
several `.vcproj` files will be created. You can then build them using Visual
Studio.
On Mac OS X with Xcode installed, a `.xcodeproj` file will be generated.
#### Incorporating Into An Existing CMake Project
If you want to use gtest in a project which already uses CMake, then a more
robust and flexible approach is to build gtest as part of that project directly.
This is done by making the GoogleTest source code available to the main build
and adding it using CMake's `add_subdirectory()` command. This has the
significant advantage that the same compiler and linker settings are used
between gtest and the rest of your project, so issues associated with using
incompatible libraries (eg debug/release), etc. are avoided. This is
particularly useful on Windows. Making GoogleTest's source code available to the
main build can be done a few different ways:
* Download the GoogleTest source code manually and place it at a known
location. This is the least flexible approach and can make it more difficult
to use with continuous integration systems, etc.
* Embed the GoogleTest source code as a direct copy in the main project's
source tree. This is often the simplest approach, but is also the hardest to
keep up to date. Some organizations may not permit this method.
* Add GoogleTest as a git submodule or equivalent. This may not always be
possible or appropriate. Git submodules, for example, have their own set of
advantages and drawbacks.
* Use CMake to download GoogleTest as part of the build's configure step. This
is just a little more complex, but doesn't have the limitations of the other
methods.
The last of the above methods is implemented with a small piece of CMake code in
a separate file (e.g. `CMakeLists.txt.in`) which is copied to the build area and
then invoked as a sub-build _during the CMake stage_. That directory is then
pulled into the main build with `add_subdirectory()`. For example:
New file `CMakeLists.txt.in`:
```cmake
cmake_minimum_required(VERSION 2.8.2)
project(googletest-download NONE)
include(ExternalProject)
ExternalProject_Add(googletest
GIT_REPOSITORY https://github.com/google/googletest.git
GIT_TAG master
SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/googletest-src"
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/googletest-build"
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
TEST_COMMAND ""
)
```
Existing build's `CMakeLists.txt`:
```cmake
# Download and unpack googletest at configure time
configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "Build step for googletest failed: ${result}")
endif()
# Prevent overriding the parent project's compiler/linker
# settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Add googletest directly to our build. This defines
# the gtest and gtest_main targets.
add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
${CMAKE_CURRENT_BINARY_DIR}/googletest-build
EXCLUDE_FROM_ALL)
# The gtest/gtest_main targets carry header search path
# dependencies automatically when using CMake 2.8.11 or
# later. Otherwise we have to add them here ourselves.
if (CMAKE_VERSION VERSION_LESS 2.8.11)
include_directories("${gtest_SOURCE_DIR}/include")
endif()
# Now simply link against gtest or gtest_main as needed. Eg
add_executable(example example.cpp)
target_link_libraries(example gtest_main)
add_test(NAME example_test COMMAND example)
```
Note that this approach requires CMake 2.8.2 or later due to its use of the
`ExternalProject_Add()` command. The above technique is discussed in more detail
in [this separate article](http://crascit.com/2015/07/25/cmake-gtest/) which
also contains a link to a fully generalized implementation of the technique.
##### Visual Studio Dynamic vs Static Runtimes
By default, new Visual Studio projects link the C runtimes dynamically but
Google Test links them statically. This will generate an error that looks
something like the following: gtest.lib(gtest-all.obj) : error LNK2038: mismatch
detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value
'MDd_DynamicDebug' in main.obj
Google Test already has a CMake option for this: `gtest_force_shared_crt`
Enabling this option will make gtest link the runtimes dynamically too, and
match the project in which it is included.
#### C++ Standard Version
An environment that supports C++11 is required in order to successfully build
Google Test. One way to ensure this is to specify the standard in the top-level
project, for example by using the `set(CMAKE_CXX_STANDARD 11)` command. If this
is not feasible, for example in a C project using Google Test for validation,
then it can be specified by adding it to the options for cmake via the
`DCMAKE_CXX_FLAGS` option.
### Tweaking Google Test
Google Test can be used in diverse environments. The default configuration may
not work (or may not work well) out of the box in some environments. However,
you can easily tweak Google Test by defining control macros on the compiler
command line. Generally, these macros are named like `GTEST_XYZ` and you define
them to either 1 or 0 to enable or disable a certain feature.
We list the most frequently used macros below. For a complete list, see file
[include/gtest/internal/gtest-port.h](https://github.com/google/googletest/blob/master/googletest/include/gtest/internal/gtest-port.h).
### Multi-threaded Tests
Google Test is thread-safe where the pthread library is available. After
`#include "gtest/gtest.h"`, you can check the
`GTEST_IS_THREADSAFE` macro to see whether this is the case (yes if the macro is
`#defined` to 1, no if it's undefined.).
If Google Test doesn't correctly detect whether pthread is available in your
environment, you can force it with
-DGTEST_HAS_PTHREAD=1
or
-DGTEST_HAS_PTHREAD=0
When Google Test uses pthread, you may need to add flags to your compiler and/or
linker to select the pthread library, or you'll get link errors. If you use the
CMake script or the deprecated Autotools script, this is taken c
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快速人工神经网络(FANN)是现代计算智能的一个重要组成部分。这些网络模拟了人脑从大量数据中学习的能力,使其在处理复杂模式时表现出色。其速度的核心在于其独特的架构,允许并行处理,类似于人脑中的神经元同时操作。 FANN库的设计目的是易于使用和高效。其核心功能包括: 多种激活函数:支持多种激活函数,允许开发人员实验不同的网络配置,以实现最佳性能。 灵活的隐藏层:支持调整隐藏层,以微调网络的性能。 多语言支持:支持多种编程语言,使其对更广泛的开发人员社区可用。 图形用户界面:提供了简化神经网络开发和分析的图形用户界面。
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