ref #110

NDK now uses ninja for building but yaml-cpp would emit the “ninja: error: build.ninja:326: bad $-escape (literal $ must be written as $$)” error due to syntax error in the generated build.ninja file. Related issue: https://github.com/jbeder/yaml-cpp/issues/630

Splitting the condition of the if statement containing `constant expression` eliminates warnings in Visual Studio with /W4.

The issue is that numbers like
2.01 or 3.01 can not be precisely represented with binary floating point
numbers.

This replaces all occurrences of 'std::numeric_limits<T>::digits10 + 1' with
'std::numeric_limits<T>::max_digits10'.

Background:
Using 'std::numeric_limits<T>::digits10 + 1' is not precise enough.
Converting a 'float' into a 'string' and back to a 'float' will not always
produce the original 'float' value. To guarantee that the 'string'
representation has sufficient precision the value
'std::numeric_limits<T>::max_digits10' has to be used.

* Removed an expression which is always true
* The second expression (ch is space) is removed because the first one contains space 0x20
* nextEmptyLine is always false so it is removed from the expression

Let CMake handle the default optimizations for various configurations. We don't need to override them. In fact, overriding them makes it impossible for users to override them themselves.

- Option defaults to ON and setting it to OFF, disables install
  target generation

* fix up static, so works as DLL

Variable "it" was shadowed

* Skip newlines in binary decoding
This fixes #387

* Skip all whitespace characters

This also removes spaces and tabs in addition to newlines.

Roll-forward of c90c08cc "Revert "Improvements to CMake buildsystem (#563)""

NEW:

* Replace CMAKE_SOURCE_DIR with CMAKE_CURRENT_SOURCE_DIR

Fixes #612 when yaml-cpp is used as a git submodule.

ORIGINAL:

* Move enable_testing() into proper place

* Added CMake's checks for C++11 standards

Raised minimal version of CMake to 3.1, since on old systems there no
decent compilers that supports c++11.

Closes #377.

* Externalize googletest project

Externalize gtest to avoid installation, fixes #539.

* Remove defined cmake_policies

CMP0012 - OLD marked as deprecated for >=cmake-3.1 and will be removed
CMP0015 - does not affect to build process
CMP0042 - already NEW for >=cmake-3.1

Fixes #505

* Fix compiling in Windows MSVC

This reverts commit 3e33bb31.

The original commit broke the build (#612) when yaml-cpp is used as a git submodule.

* Move enable_testing() into proper place

* Added CMake's checks for C++11 standards

Raised minimal version of CMake to 3.1, since on old systems there no
decent compilers that supports c++11.

Closes #377.

* Externalize googletest project

Externalize gtest to avoid installation, fixes #539.

* Remove defined cmake_policies

CMP0012 - OLD marked as deprecated for >=cmake-3.1 and will be removed
CMP0015 - does not affect to build process
CMP0042 - already NEW for >=cmake-3.1

Fixes #505

* Fix compiling in Windows MSVC

Fix the compiler error which prevents deriving from std::iterator in C++17

It was incorrectly left at 0.6.0 when 0.6.1 was released, so this needs to be done to make it consistent between the tagged version and the CMake version.

pkg-config should be giving absolute paths rather than relative paths.

* Change None in C/C++ source to NoneType.

Prevent name conflict with X11 None definition.

Don't build tests if the confusingly named YAML_CPP_BUILD_TOOLS is ON.
Instead, add a new option that controls only if the tests are built.
(Also, default tests to OFF.)

Fix some virtual methods of NullEventHandler that were apparently
intended to overload base class methods, but did not. Add override
keyword to prevent these getting out of sync again.

Add explicit virtual dtor to GraphBuilderInterface. This avoids tripping
a -Wnon-virtual-dtor warning, and also ensures that the correct
(virtual) dtor is called if an instance is deleted via a pointer to the
base type.

Remove use of CMAKE_INSTALL_PREFIX when specifying install destinations.
It is preferred that install destinations are specified as relative
paths, not absolute paths. This is also needed to create relocatable
installs, and thus should fix #526.

Don't install LIBRARIES on Windows to `bin`; they belong in `lib`. (This
appears to have been done in a mistaken attempt to install the DLL's to
`bin`, which do need to be there, but RUNTIME DESTINATION already takes
care of this.)

The combination of clang++ 3.4 with libstdc++ from GCC 4.6
doesn't work.

Note that with the release of 1.8.0, googlemock and
googletest are unified into a single release.

This way it's possible to build using older MSVC (<13) that don't
support this yet. Macro is undefined in each file where it is used so it
should stack well with other libs and sources.